Kos & Nisyros sailing holidays

Kos - Κως lays at the mouth of the Turkish Gulf of Kerme (Turkish: Gökova Körfezi) which cuts deep into the coast of Asia Minor.

The island was separated from the Bodrum Peninsula by the collapse of a rift valley in the Pliocene period, which explains the range of limestone hills, rising to 846 m in Mount Dikaios, that runs along Kos island SE shores.

It is the largest island in the Dodecanese after Rhodes and, unlike most other Aegean islands, Kos has a population that is increasing in numbers, and is a weightier charter base for yacht rental companies than Rhodes.

The ruins of the early Christian Agios Stefanos Basilica, and Kastri islet with the chapel of St. Nicholas at Kefalos bay & Kamari port on Kos island.

Previous islands: Leros and Kalymnos ↑

Sailing map of Kos and Nisyros - Yacht charters in Greece
Pserimos, Kos and Nisyros
Approximate and disputed borderline coordinates between Turkey and Greece:
1   36° 57.760' N    27° 16.189' E
2   36° 57.012' N    27° 24.158' E
3   36° 47.417' N    27° 21.943' E
4   36° 43.158' N    27° 18.162' E
5   36° 41.895' N    27° 17.979' E
6   36° 35.520' N    27° 19.951' E

Next island: Astypalaia ↓

Visit the caldera of the Nisyros volcano: you will experience that these fumaroles are true solfataras!

Just South of Kos is Gyali / Yiali – an obsidian island – which houses an ugly pumice quarry.

The origin of this pumice is the volcanic island of Nisyros (a big strato-volcano, which was built up above sea level about 66,000 years ago). It was occasionally active in the Middle Ages but now manifests itself only in the form of solfataras. Pumice from the eruptions may be found in 100 m thick beds on the higher parts of the island and is exported.

You might want to look now at the Glossary of Volcanic & Geologic Terms.

Nisyros is a green and well-watered island, with fertile soil which is cultivated on laboriously construced terraces on the outward-facing slopes.

Further South is the beautiful island of Tilos (Italian: Piscopi or Episcopi), which is less frequently visited by tourists and yachties. Near Livadia, the island's port, are the ruins of a Venetian castle and the Kharkadio cave, in which the bones of prehistoric dwarf elephants were found.

British Admiralty Charts 1055, 1531

Tilos - yacht charters Dodecanese.
Tilos island

Kos, Nisyros and Tilos ports & anchorages

Kos island

Clockwise ↻

Nisyros island

Clockwise ↻

Gyali island

Pergousa islet

Kos chart

Kos island nautical chart Kos Island Kos marina Kos Port Kalymnos Island Kalymnos port Pserimos Island Pserimos port Kardamaina Kastri Kamari Limnionas Mastichari Turkey Knidos Gyali
Kos island chart, ports / anchorages are clickable

Kos island

The island and town of Kos has been well populated since Neolithic times.
About 700 BCE, together with the five other cities of the Hexapolis (Knidos, Lalysos, Lindos, Halikarnassos and Kamiros), Kos was an outpost of the Dorian League of cities on the Carian coast and the neighbouring islands.

The island was celebrated for the oldest cult site of the healing god Asklepios and for a medical school of which the most famous representative was Hippokrates (5th c. BCE). The Sanctuary of Asklepios on Kos was distroyed by an earthquake in 554 CE.

The “old port” of Kos - with palm trees, mosque and Venetian castle - is distictly more attractive than Kos marina.

The Byzantines were succeeded as rulers of the island by the Knights of St John (1306 – 1523), who in the 14th c. established the main seat of their Order in the island's capital Narangia (now the town of Kos).

Kos was captured by the Ottomans some years earlier than Rhodes. Occupied by Italy in 1912, during the Balkan War, it was returned to Greece in 1948.

Kos port

The “old port of Kos” or simply Kos port - Λιμάνι Κω is located in a large shallow bay; in the approach the North cape should be kept at a distance.

The West side inside the harbour is mostly for charter or local yachts only. The East side – under the Castle of the Knights (1450 – 80) and matching palm trees – is the mooring area for visitors, but only if you are fortunate enough to find a berth here in these lovely surrroundings of the old port.

Kos town is full of bougainvillea, jasmine and exotic whiffs of the middle east.
Our personal top 3 of restaurants is “Aliada”, “Lovemade” and “Kapari Meze”.  

Kos port - sailing holidays Dodecanese islands
Old port Kos
Kos port, seen from the NW, with the marina in the background.
Kos port seen from the SE.
The castle and port of Kos.

Kos marina

The bland utilitarian Kos marina - Μαρίνα Κω has its merits for the yacht charter companies and is still within walking distance of downtown Kos. Note that there is a wide variety in quality of the offered yachts.

Except for severe weather forecasts try to get a berth in the pleasant old port first.

Upon approach contact the Kos marina office on VHF 77

The marina offers all-round shelter with 250 berths, you will use a permanent mooring. The harbour master will meet you near the entrance in a RIB and assist you towards your spot.

Fuel quay is located south of the Kos marina.

Kos marina.
The Asclepeion archaeological site 100 m above Kos town. This ancient sanatorium[In Dutch] was founded in the 4th c. BCE, in use till Roman times, and only in 1902 rediscovered and excavated.
Kos marina, looking West. Fuel quay in the foreground, and Kos port & town in the background.
Pserimos island on the horizon.

Kardamaina

The port of Kardamena or Kardamaina - Καρδάμαινα offers allround shelter, a great beach, and all amenities: a convenient place to resupply.
However, there aren't many berths available for visiting yachts → VHF 12 Harbour Office.
Moreover, this stretch of coast – bordering Kos Airport (KGS) – caters to both lager louts and posh British tourists, meaning aquaparks, boozing bars and beach resorts – even two outlandish “Pirates of the…” ships. This tourist trap has become as unGreek as it gets. Yet, astonishingly, in 2000 this was still an authentic fishing port where you had to go stern-to a sloping soft-sandy quay!

Note that the GWP chartlet doesn't show the dangerous silts near the entrance and around the green harbour light.
Make your approach from the South and perform a rather tight rounding around the red harbour light; any swimming platforms outside the port have long gone.
Go stern-to the Northern section of the quay, or alongside (rafting up) the North side the concrete pontoon. occasionally, alongside the breakwater in the SE corner (not suitable in Meltemi); good holding in sand (some patches of weed).

Academy

The word academy comes from the Greek word “Akademeia”, the name of the grove outside of ancient Athens where Plato taught his students. Akademeia grove in turn was named in honor of a Greek hero: “Akademos”… →

Directly South of the port is the archaeological site of Alasarna where continuous excavations unearthed, again in 2020, many significant finds.
A 40 min. hike uphill is the 14th c. Antimachia Castle [in German] surveying the busy strait between Kos and Nisyros.

Kardamena (Kardamaina) port seen from the South. Note the concrete pontoon inside the basin.
The NW corner of Kardamaina port with visiting yachts stern-to the waterfront, and alongside the concrete pontoon.
The volcanic islet of Kastri / Ag Nikolaos / Palaiokastro, with the famous wedding Church of Ag Nikolaos, in Kamari bay just North of Kamari port / anchorage.
The Basilica of Ag Stefanos 469 – 554 BCE is just ashore.

Kamari

Kamari - Καμάρι is the recognised name of the port and marvelous turquoise bay under Kefalos - Κέφαλος village Lat Long

The GWP incorrectly calls the bay and port “Kamares” or “Kamara”, and “Palaiokastro” is locally known as the anchorage under Kastri.
See, Kamares (Greek: Καμάρες, “arches”), the main port of Sifnos island.
Also, the labelled ferry quay never existed and the basin is reserved for local vessels. Fortunately, Eagleray, Navionics and C-MAP show the correct situation.  

As a result visiting yachts always go stern-to the outside, while the locals go alongside the inside. Freighters will use the mole near the red harbour light, and their mooring lines (partly) block the Southern side of this mole, leaving only room for one or two yachts, but you can easily place your second anchor on the blocks.

Most yachts will anchor in the bay, one of the preferred spots is South of the mole; good holding and safe during Meltemi; winds are typically either Northerlies or Southerlies, choose your anchorage accordingly; shallow in the North and deep in the South of the bay.

Restaurant of choice is “Cavos” located on the beach directly North of the port; the owner is also a beekeeper and vends delicious honeys.
On the ridge above the Kamari bay is Kefalos village and the ruins of the Kastro.
This Southern section of Kos is arguably the prettiest, with appealing seascapes, fertile hills, steep cliffs, and less tourism.

Close-up of Kamari port, looking West, with in the foreground the area where the cargo ships dock. On the left (South) is the best place to go stern-to.
Sailing yacht anchored in one of the preferred spots in Kamari bay, just “under” the mole of Kamari port (ideal in Northerlies).
Kamari bay with Kamari port in the distance. To the left the beginning of the stretch of pretty seascapes that continues around the Southern tip of Kos.
Overview of Kamari port and bay, Kastri islet, Kos island.
Overview of Kamari bay, looking NE, with a freighter docked in Kamari port and another freighter waiting at anchor.
Kastri islet on the North side (left) of the bay. Hi-res image

Limnionas

Limnionas - Λιμνιώνας is suggested as allround shelter by various guides (including the GWP and Eagleray), but we never dared to enter this small and shallow harbour Significantly, we only once saw a small catamaran inside… Lat Long
Mind the shoal roughly near the “Taverna Limionas”; local fishing boats have rights to all the quayside; old (but working) beach shower ashore; allround shelter; 2,5 m depth max. and silted at the W and S inside the basin; weed patches and sandy bottom; keep close to the green harbour light when entering, but entrance is still >30 m wide; taverna serves (rep. very good fish dishes) only during daytime, very quiet in the evening.
This fishing port is proper for catamarans / yachts with a draft of <1.50 m.

The shallow fishing port of Limnionas looking SE. Note the silted coast opposite the green harbour light.
Mastichari port looking West (the wooden piers belong to hotels).
Mastichari port, looking NE, with Pserimos island in the distance.

Mastichari

The insouciant ferry port of Mastichari - Μαστιχάρι on Kos' north-east coast is a safe harbour during a Meltemi (NW). Moreover, Mastikhari offers solid shelter from SSE – NNE winds.
Caution 1) SE storms are problematic and NE – E storms bring in such high waves that it is untenable.
Caution 2) The port is known for its bad holding due to dead weeds and thin mud / sand, making it extra difficult in Southerlies.

Note that only a tiny area inside the basin is not silted up, and you should stay quite close to the North quay   check Eagleray, Navionics or C-MAP before entering.

Since the port seems a well kept secret, berths are predictably available, despite space for just 5 – 7 cruising / charter yachts.
Go stern-to the North quay between the day tripper boats on the West side and the ferry dock near the harbour light. The “Olympios Zeus” car ferry to Kalymnos sails 2+ times a day, see time table.
The preferred berths are on the West (but shallower) side, because the ferry's mooring lines can spread out at 45 degrees. Lat Long Moreover, a smaller ferry (several operators) can go alongside in the middle section, see time table.
On the quay there are water faucets, but no electricity.

Hidden in a backstreet is the very affordable “O Makis” psarotaverna / fish restaurant   , the cook catches the fish as well.
The town is tranquil, child friendly and clean – friends of us spotted dolphins inside the port (2021 Oct).

If you need to drop off, or pick up crew   the Kos Airport (Antimachia village) is a mere 10 min. taxi drive away.

The German archaeologist Ludwig Ross, while visiting Kos in 1844, saw the remains of an ancient port and ruins of a settlement from the early Christian period in the vicinity of Mastichari, and a 15 min. hike along the SW coast brings you to the archaeological site of the Early Christian Basilica of St John, which ground plan is well preserved.

After the devastating earthquake that hit Antimachia in 1926, 18 families decided to settle in Mastichari, named after the mastic trees that used to thrive in the area. In 1930, the topographic service of the Italian administration implemented an urban planning of Mastichari, with an orthogonal grid of 5 and 3 roads.

In 1944, the Germans built a wooden pier for military purposes that remained in use until the current harbour was constructed in the eighties. For decades, the largest part of Antimachia’s production of watermelons was gathered on Mastichari’s beach and shipped to Kalymnos.

Nisyros, Gyali chart

Nisyros island nautical chart Gyali island - Antonios Pergousa islet Mandraki port Palon port Grána Nisyros Island
Nisyros island chart, ports / anchorages are clickable

Gyali island

The volcanic island of Gyali, Giali or Yali - Γυαλί (Greek for “glass”) isn't very sightly with its industrial vibe due to strip mining, yet is one the safest places in stronger Northerlies / Meltemi.

It consists of two distinct segments – connected by a narrow 250 m wide isthmus – the NE part almost entirely made of obsidian (volcanic glass, hence its name) and the SW part of pumice (volcanic ash). The water there is sometimes whitened by the mineral dust.
The last eruption was around 1460 BCE – relatively short after the Minoan Eruption of Santorini.

Archaeological finds show that the island was already settled near the end of the Neolithic period, approx. 4500 – 3200 BCE, and also in Hellenistic and Roman times.
Local obsidian was of lesser quality than that of Milos, which hampered trade.

Anchor over sand in 4 – 6 m NE of the three piers for loading pumice. Lat Long Not everywhere solid holding, make sure your anchor holds (Eagleray even mentions “poor holding”); mind the mooring buoys used by freighters.
The isthmus has a pleasant beach, yet for snorkeling try the rocks close to Ag Antonios.
Mind the hazardous reef 0.4 NM SE off the Southern Cape Kaloutoi of Gyali island.

Sailing yachts anchored in Gyalis bay near the isthmus, with the three loading piers (one wooden in the middle) in the foreground, as seen from the SSE. The freighter is docked to the conveyer-belt pier, note the mooring buoys. Kos island on the horizon.
The white blocky Church of Ag Antonios (St Antony) on top of Antonios islet, which is losely connected by a reef (front and right) to Giali island.
The lighted Ag Antonios islet with Gyalis' pumice mine in the background and sailing yachts anchored in Gyalis bay (under the isthmus). Perlite loading pier on the right. Kos island with Krikelios Cape top right.

The lighthouse of the islet of Ag Antonios - Άγιος Αντώνιος signals the treacherous shoal & rocks awash towards the South.
The islet's beach on the North side has old tyres, rusty buoys, plastic bottles. Moreover, caïques and the “pirate ship” from Mandraki dock on the NNE tip.
Although Giali and St Antonios are losely connected by a shoal, it seems possible to navigate around the two / three shallow patches; anchor at either side of this dubious zigzag “passage”; excellent protection and good holding in sand. Lat Long

Pergousa islet

Pergousa - Περγούσσα is a low islet 4,5 NM WSW of Mandraki (Nisyros).
Reportedly (we only sailed past) a fair weather anchorage in the SE bay Lat Long; anchor over sand between seaweed beds; good holding; open to NE – SW.
The islet is home to the Erhard's wall lizard.

Pergoussa seen from the South, with the anchorage on the right (East).

Nisyros island

Nisyros (Nisiros) - Νίσυρος unmistakably breathes “volcano” with its mephitic mud pools, vapour holes, cliffs of kaleidoscopic colour, and the ubiquitous and ephemeral formations of brilliant yellow, feathery sulphur crystals → a visit to its active volcano craters is the main attraction as well as the volcanological museum in Nikia village.

Together with all the islands discussed on this page, Nisyros belongs to the “South Aegean Volcanic Arc” AKA “Hellenic Arc”, which comprises a number of dormant and historically active volcanoes, including Aegina, Methana, Milos, Santorini and Kolumbo, Kos, Nisyros and Yali. Of these, only Santorini, Kolumbo and Nisyros have either erupted or shown any significant evidence of unrest during the past 100 years.

Nisyros' volcano facts:

  • caldera of 3.8 km diameter, and just 100 m above sea level
  • 6 lava domes (five inside the caldera) with Profitis Ilias the highest at 698 m
  • Stefanos Crater of 300 m diameter in the SE corner
  • other noteworthy craters are Alexandros, (Micro) Polyvotis and Kaminakia
  • ± 25 thousand yrs ago the volcano collapsed and the current caldera was formed
  • recent erruptions: 1422 (not completely certain), 1871, 1873, 1888 en 1956
  • a slowly rising magma chamber currently lies at a depth of 3 – 4 km

See Volcano World • Nisyros.

Sulphur from the craters has been intermittently exploited from early Antiquity (Phoenicians) up until the Ottoman occupation, when it was prized as an ingredient in explosives.
Stefanos crater seen from the NE, with the caldera rim in the background.
Smoking fumaroles – Stefanos Crater.
In the late 19th century a British company collected and shipped Nisyros' sulphur through the island’s South coast “harbour” of Aghia Irini.

Nisyros was originally settled by Dorians from Kos and Kamiros (Rhodes). In 1312 it was occupied by the Knights of St John, and later became a fief of the Assanti family. It was taken by the Turks in 1533.

A caldera is not the same as a crater

  • A caldera is a depression created after a volcano releases the majority of the contents of its magma chamber in an explosive eruption. Without any structural support below, the land around the erupting volcanic vent or vents collapses inwardly , creating the bowl-shaped caldera, as much as 100 kilometers wide.
  • Craters are formed by the outward explosion of rocks and other materials from a volcano, and are usually more circular than calderas.
    Calderas, like Milos or Santorini, may have parts of their sides missing because land collapses unevenly.
    Craters are also usually much smaller than calderas, only extending to a maximum of one kilometer in diameter.
    Nisyros is a textbook example with its <100 – 300 m craters inside a nearly 4 km caldera.
Interactive geological map of Nisyros' volcano.

Nisyros can experience the Meltemi Etesian wind through late June – August.
This is most obvious on the Eastern and Western flanks of the volcano, where trees are bent towards the South from the force of the winds. The wind may be especially strong on the island due to jet effects as it passes over Kos.
Weather forecasts on board.

Mandraki

Mandraki - Μανδρακι is the ferry port and capital of Nisyros and exposed to NW – SE and untenable in stronger northerlies. Moreover, the ferry wash and tripper boats – even a hilarious pirate ship – diminishes the likelyhood that you can leave your yacht safely unattended.
South winds can be strong but don't involve waves, the Easterlies are potentially dangerous with high seas.

However, the higgledy-piggledy town is a delight with its cute Cycladic cubed houses, bougainvillea adorned and watched over by the Venetian Castle and the 14th c. Panagia Spiliani Monastery, see Virgin of the Caves. The small but stimulating Archaeological Museum as well as a climb to the Paleokastro acropolis are a must.
Good holding, yet (very) few berths for visiting yachts; VHF 12.
Rent scooters to visit the craters.  

Mandraki port and town, as seen from the NNE, with the Panagia Spiliani Monastery on the steep bluff (top right).
Palon (Pali) port, as seen from the West, is the preferred place to explore Nisyros from.
Palon port, as seen from the SE, with Gyalis island (note the low isthmus) in the background and Kos island on the horizon.

Palon

The charming port of Palon, Paloi or Pali - Παλοι offers allround shelter, which is rare in this part of the Dodecanese.
Starting out of the yacht charters base of Kos marina, you will can reach Pali before dusk, but in season the port can be packed. The basin can accommodate 40+ yachts / catamarans, or 50+ if yachts are able to raft up near the red harbour light.

Strong northerlies (including Meltemi, NW) make the entrance cumbersome. Worse again, the South side of the entrance is silted up. Most charts show buoys marking the silts, however we have never seen any buoys (not in 2019, 2020 or 2021, or before). Keep close to the green harbour light, because the existence of the silts is not disputed.
Anchor over sand / mud (a few stones); solid holding.
Depths in port and the entrance are a mere 2 – 3 m.

Rent a car, motorbike or e-bike from Manos at the base of the north mole (also in Mandraki port). Moreover, Manos can arrange fuelling via tanker for your yacht.

Despite a couple of worthwhile restaurants on the waterfront, you should consider the very modestly priced “Apyriá” - Απυριά; superb dining in the picturesque Church yard of Emporio village, 6 km uphill upvolcano.

Grána

The small bay of Grána - Γράνα is suitable for a lovely lunch stop Lat Long just West of Cape Avlaki / Loutros. There are thermal springs (hence the toponym “Loutra”) near the Church of St Panteleimon (Orthodox spelling), compare Nanou's St Pantaleon (Roman Catholic spelling), festivities 27 and 28 July.

The sunken pier (Avlaki “harbour”) below the Church is now purposeless for anything bigger than a dinghy, and the area has quite a few hazards. Anchor in 5 – 10 m over sand and some patches of weed.

Slightly further to the West is the inconspicuous and abandoned “harbour” of Ayia Irini from which sulphur was shipped from the island.

Tilos island chart

Tilos island nautical chart Gaidaros islet Plaka beach St Anthony (Ag Antonios) port Limenari Eristos Skafi Kokkini Livadia port Tholos (Theologos) Tilos island Ag Sergios Ag Zacharias / Despoti(ko) Nero
Tilos island chart, ports / anchorages are clickable
Verdant Tilos landscape with flowers and rainy clouds in spring.

Tilos island

Tilos - Τήλος has been one of the best-kept secrets in the Dodecanese for some time, with good unspoiled beaches, friendly people and wonderful walking country: a tranquil antidote to Kos town.

From a distance it looks arid but it shelters groves of figs, almonds, walnuts, pomegranates and olives, all watered by fresh springs and thriving on vulcanic soil.
Visit the Flora of Tilos – Tilo Botanico.

Pottery and stone tools discovered in Charkadio cave - Σπήλαιο Χαρκαδιό indicate human activity on Tilos in the early Neolithic period (8000 – 7000 BCE), along with the large assembly of bones from 1.2 – 1.6 m tall dwarf elephants, which not became extinct until 4 – 6 thousand years ago → coexistence of these animals with humans.
Above the cave is the castle of Mesaria (1366), with ruins of settlements and Byzantine churches, and the new (summer 2020) elephant museum, which was previously located in the Megalo Chorio (Greek for “Big Village”). The cave itself isn't open to the public, but the views over Eristos valley and Megalo Chorio are worthwhile.

The 15th c. Byzantine Monastery of Ag Panteleimonas (incl. 13th c. frescos and 18th c. woodcut temple) is set in a verdant area, full of giant cypresses and plane trees.

Pliny the Elder notes that in antiquity Tilos was known as Agathousa. In the Middle Ages, it was known by the Italians as Episcopio, either because it was a Bishop Seat or because its position as Vantage Point. The island has also been called in Turkish İlyaki and in modern Italian Piscopi.

Excavation has identified Pelasgian masonry. Moreover, the island was successively dominated by Minoans and Mycenaeans in the Bronze Age (2800 – 1100 BCE) and, after the Trojan War, by the Dorians.

The island's old capital, Mikró Chorió, first settled in the 15th c. by the Knights of the Order of St John, has been completely abandoned since 1960. The former inhabitants took the roofs and timber (wood was scarce) with them, but left the rest intact. The Church has been fully restored and a cocktail bar has set up shop.

The Romans arrived in 42 BCE, and archaeological finds from Roman and early-Christian times demonstrate the prosperity of the island until the 551 Beirut earthquake. Lateron Tilos joined fortunes with Rhodes: The Knights of Saint John took control from 1309, restoring the Byzantine castles, and building new ones in order to defend against pirate raids. It was evacuated in 1470 as the Ottomans began the Siege of Rhodes and control passed to Suleiman I in 1522 when Rhodes fell. The Italians took posession of the island, after the Italo-Turkish War, from 1912 till 1943.

Tilos – the new Dwarf Elephant Museum at Charkadio.
The new Dwarf Elephant Museum at Charkadio. Hi-res image

Livadia

The port of Livadia - Λιβάδια, at the head of a substantial bay offers now allround shelter. 18 odd years ago, when I was a young teenager, this port was nothing more than an exposed quay. Nonetheless this quiet and authentic venue was already a favourite of mine. It is still as chaotic and poorly managed but in a charming way.

Yacht charters Tilos, Nisyros and Kos
Tilos port map

Go either alongside on the inside of the mole (the area close to the green light can be reserved for caïques and such), or stern-to the waterfront.
Preferably ignore the few remaining permanent moorings, and drop your own anchor as far away as possible over sand (bit mud like) and patches of weed; solid holding. There are plans to install new lazy lines.
Wash from the ferries and swell make live in the basin much more pleasant than outside (ask the harbour master when ferries are due).

Rent scooters or a car at drivetilos.gr ~250 m South of the quay .
Good dining options in port, first and foremost “Omonoia Cafe“.  

To the East, on Cape Ag Ioannis, is the Church of Ag Ioannis - Άγιος Ιωάννης situated in lush flowery fields with majestic views over Livadia bay.

The anchorage in the bay is exposed to all Easterlies, which can be powerful in season.
The fishing port of St Stephan - Άγιος Στέφανος in the East of the bay is mostly <2 m deep.

Ferry leaving Livadia port, as seen from the WNW, with yachts at anchor in the background.
The approach from the SSE to Livadia port on Tilos.
Livadia port, as seen from the NW, with the anchorage in the background left.

Ag Zacharias (Despoti Nero)

The names Ag Zacharias - Άγιος Ζαχαρίας and Despoti(ko) Nero - Δεσποτικό Νερό refer to two adjoining beaches in the same large triangular bay, South of Livadia.
St Zacharias, the father of John the Baptist features some rocky formations for snorkeling and a mini peninsula.
The pebbled beach of Despoti Nero is located in the deepest corner, and has nothing to do with the despotic Roman Emperor Nero - Ο Νέρων: the Modern Greek word for “water” is Νερό. Open to NW – NE; off the beaten track. Lat Long
Follow the stream uphill to discover the ruins of Ancient Gera. This is a lesser known ghost village of Tilos, which served as an agricultural outpost of Megalo / Micro Chorio, fed by the nearby spring – indeed called “Despoti Nero” – and rich volcanic soil.

While rounding Cape Episkopi (East tip of Tilos) you can encounter strong currents exceeding 3 knots running either N or S, which will affect the sea state.

Agios Zacharias (peninsula) beach on the right and Despoti(ko) Nero beach at the head of the bay. Out of sight of the left is Cape Koetsoempa.
The entrance to Despoti Nero / Ag Zacharias, Livadia town (in white) and bay in the distance.
Sailing yacht rounding Cape Koetsoempa.
The double headed bay of Ay Sergios, Sergiou beach in the middle, and the snug anchorage on the far left. The islet of Choironisi in front.

Agios Sergios

Agios Sergios or Ag Sergiou - Άγιος Σέργιος is a double headed bay with the proper beach in the East cove, while the West cove Lat Long is more snug so most yachts will anchor here. Good protection from the Northerlies (yet try Tholos (Theologos) first), anchor over sand/weeds in 3 – 8 m. A tripper boat will bring bathing guests.

The remarkale multipronged Cape Trachilos, looking North, with a sailing yacht at anchor in Tholos (Theologos) bay on the left, and Ay Sergios bay on the right (East).
Cape Pelagousa, looking NE, with Tholos (Theologos) bay on the right.
At anchor off Tholos (Theologos) beach.

Tholos (Theologos)

The triangular bay of Tholos - Θόλος also known as Theologos - Θεολόγος is often overlooked, yet provides a rugged and scenic anchorage.
Mind the many reefs and rocks (awash) dotted along the east shore of the bay (snorkeling) and the tip of Cape Trachilos, and anchor in 5 – 8 m over sand (few rocks), ideally close to the short volcanic beach; surprisingly well sheltered. Lat Long
We have no familiarity with the next – ↻ – bay of Ormos Stavros, which certainly looks promising from a distance.

Eristos

The wide bay of Eristos - Εριστος offers a lovely sandy 700 m long beach where tamarisk trees provide natural shade for the summer heat.
The Meltemi gusts will come from the North and generate a swell causing rolling conditions anchor really close to the beach 3 – 5 m over sand; solid holding. Lat Long

Eristos bay and beach with magnificent views towards Megalo Chorio village.
Eristos bay anchorage Tilos with sailing yacht at anchor.
Sailing yacht anchored at the beach of Eristos looking SSE. Hi-res image

The 30 min. hike from Eristos to Megalo Chorio is optional, since locally you will want to visit “Restaurant En Plo - ΕΝ ΠΛΩ” 2 min. towards the verdant fields, and on the beach the “Kantina” from Stelios, which has been smartly upgraded in 2021 from a caravan to a real building – still reggae-themed. Furthermore, a volleybal net, and in the season pop-up tents with mainland Greeks on the beach.

Limenari

The unfrequented anchorage of Limenari - Λιμενάρι bay has two very appealing sandy beaches, which are unfortunately very shallow and therefore more suited to catamarans with a draft of <1.30 m.
Exposed to SSE – W winds; reliable holding in sand; handy large rock + shoal Lat Long to take a line to → drop anchor in 3 – 6 m in NE direction; swimming / snorkeling and solitude.
Alternatively, anchor precisely in the middle Lat Long in 3 – 4 m, or as close as possible to the East beach, see photo below. The North beach is even more shallow.

At anchor near the East beach in Limenari bay.
The Northeastern cape of Tilos: Cape Spano (Pounta), looking NW, with Plaka beach on the left.
Gaidaros (Gaidaronisi) islet behind it, and Nisyros on the horizon.
Sailing yacht anchored off Plaka beach, with Cape Spano (Pounta) on the right, looking North.
The islet of Gaidaros (Gaidaronisi) is visible behind the headland.

Gaidaros

The small islet just North of Tilos island, Gaidaros Megalou Choriou - Γάιδαρος Μεγάλου Χωριού or in short: Gaidaros (Gaidaronisi) - Γάιδαρος (Γαϊδουρονήσι) meaning Donkey islet, has a suitable anchorage on the SSE side; Lat Long anchor in 3+ m over sand (the weed patches are clearly visible) and take a line the Northern side of the beach (NW corner); delightfully off the beaten track; exposed to ENE – SSW winds. There is a lighthouse on the North side and you will find some remaining concrete+wooden structures from the Italians.
Gaidouronisi was a metochion of the on Tilos situated Monastery of Agios Panteleimonas - Μονή Aγίου Παντελεήμονα.
Note that there is also a similarly named Gaïdaros (Livadion) islet just North of Livadia port.

Plaka

Plaka - Πλάκα beach under the North Tilos' Cape Spano (Pounta) is a safe anchorage even during strong Meltemi (here NNW). Just North of the beach (mostly pebbled) is a conspicious wind turbine.

This spot is known for its excellent holding; anchor close to the shore in 5 – 10 m over sand (and patches of weed) Lat Long the bay is deep; nearly allround protection, yet very vulnerable to NNE – NE winds,   in which case you should relocate to either Livadia or the South coast (Limenari or Eristos).
The encompassing bay is called Ormos Ag Antoniou or O. Plagio / Playio.

The second reason to drop anchor here – aside from finding shelter – is to visit the Monastery of Agios Panteleimonas - Μονή Aγίου Παντελεήμονα (also the island's patron saint), which is a 40 min. hike up the slopes of Mt Profitis Ilias (654 m).
The well preserved monastery features fresh cold water springs as well as an enormous loquat tree, all set in verdant surroundings that span the island's width.

The port of Ay Antonios, looking NW, with from left to right: Cape Spano (Pounta), Gaidouronisi islet and Nisyros island in the distance.

St Anthony

The delightful port of St Anthony or Ag Antoniou or Ag Antonios - Αγίου Αντωνίου, Άγιος Αντώνιος has lots to offer except… actual space.

Entering in strong Northerlies can be tricky – Plaka would then be “plan B” – but once inside the protection is allround. Lat Long
Solid holding but you will likely go alongside the N or NE mole where you will find a single shore power pillar (consult the fishermen).

Depths inside the basin are sufficient, but there is a sandbar (extending from the South) at the entrance: keep real close to the red harbour light. Larger (45+ ft) yachts should first run reconnaissance, or approach only in light conditions; very little manoeuvring space → use bow thrusters; the Hanse 505 was a tight fit
C-Map and Eagleray show the correct situation and depths. The GWP finds this venue quite unfavourable, which only adds to the tranquility → more than two yachts is rare.

Both the “To Delfini” - Το δελφίνι taverna overseeing the port, and “Elpida Restaurant” (meaning “Hope”) 250 m West on the waterfront are an added bonus.  
It is a 45 min. hike up to the Kastro.  

Note that there is also a St Anthony islet under Gyalis island.

Aerial view of the 14th c. Kastro (Castle of Megalo Chorio) towering over the port of Ag Antonios. Previously a Byzantine castle built on a Hellenistic acropolis which included a temple dedicated to Apollo and Athena. Inhabited until 1827, it is the best preserved one of the 7 castles on Tilos.
The entrance of Ag Antonios (St Anthony) port, seen from the Taverna, with Gaidouronisi islet and Nisyros in the distance behind Cape Spano (Pounta).
Overview:  Gaidaros islet lying off Cape Spano (Pounta);
under this cape is Plaka beach;
and St Anthony port is seen below.
On the horizon is Nisyros island.

Skafi

More or less No-go is the rectangular bay of Skafi - Σκάφη situated “in” the North cape of Tilos Lat Long where you sometimes see yachts anchored. However, there are submarine cables and the ambience is below par. The beach is rather littered and is usually a lee shore; very shallow near the S and SE end.

At anchor (with a line ashore) in Kokkini bay – looking SE – Gaidaros-Livadion islet on the left. Khokhlakari bay and Livadia bay start on the right.

Kokkini

The bay of Kokkini - Κοκκίνι Lat Long is unnamed on most charts – with directly SE a larger and more exposed bay called Ghoghlakari or Khokhlakari – both these bays are very shallow.
Anchor in 4 – 6 m, which means hardly “inside” the bay.
Most yachtspersons will consider this a lunch-stop anchorage, but it offers lots of privacy: like Ag Antonios port, Tholos or Limenari it is a well-kept secret.

  There is no passage between Gaidaros-Livadion and Tilos, see photo.

Note that there is a similarly named Gaidaros islet (with an anchorage) to the North of Tilos.