Kleftiko Milos: The Complete Guide to the Pirate Cave
What is Kleftiko?
Kleftiko is the most spectacular natural landmark in Milos — and arguably in the entire Cyclades. Located on the southwestern tip of the island, it is a dramatic complex of towering white volcanic rock formations rising straight from the sea, riddled with caves, arches and swim-through passages carved by centuries of waves.
The name comes from the Greek word kleftis — thief. In the 18th and 19th centuries, pirates used these hidden sea caves as shelter, concealing their ships inside the rock formations and launching raids on passing vessels. The caves are deep enough to sail a small boat into, which made them the perfect hideout. Today they are one of the most photographed places in Greece.
What makes Kleftiko truly special is that there is no road, no path, no way to reach it from land. The only way in is by boat — which means the moment you round the western cape and the white rocks appear, you are sharing that view with almost no one else on foot.
The Stops Along the Way
The journey to Kleftiko from Agia Kyriaki Beach is itself part of the experience. Poseidon Milos follows the southern coastline of the island — the most sheltered, dramatic and least-visited stretch of Milos — stopping at some of the island's most extraordinary beaches before arriving at the cave complex.
Gerakas
The first stop is Gerakas, a beach accessible only by boat. The sand here is bright white and the water shifts from turquoise to deep blue within a few metres. What makes Gerakas unique is its volcanic background: enormous slides of sand cascading down from the cliff face, and small caves at the waterline where you can still feel warm steam rising from the geothermal ground below. Milos is a volcanic island, and Gerakas is where the geology makes itself felt.
Tsigrado
Tsigrado is one of those Milos beaches that has become famous precisely because it is so hard to reach. By land, you descend using ropes and a ladder fixed into the cliff face. By boat, you simply anchor and swim in. The beach is tiny — a narrow strip of white pebble between two rock walls — but the water is extraordinary: completely enclosed, completely calm, completely clear.
Kleftiko
Kleftiko is the main event. As you approach from the east, the white rock formations rise up like a natural cathedral — some reaching 20 metres above the waterline, their surfaces bleached by sun and salt into an almost chalky white that contrasts sharply with the deep blue of the sea below.
You anchor here for a long swimming stop. The caves are at water level and you can swim directly into them — some open on both sides so you can swim through from one cove to the next. The light inside the caves catches the water and reflects it back in patterns of green and gold. It is, genuinely, one of the most beautiful places in Greece.
This is the spot that makes Milos different from every other Greek island. There is no beach here, no sunbeds, no taverna. Just the rock, the sea and the caves.
Sykia Cave
From Kleftiko you round the western cape to reach Sykia — the cave of the fig tree. Unlike Kleftiko, which is open to the sky, Sykia is a collapsed sea cave: you enter through a low passage at water level, sailing or swimming through into a large enclosed chamber. The roof has partially collapsed, leaving a natural skylight through which the sun pours directly into the cave.
The effect is extraordinary. The emerald water glows from within, lit by the column of sunlight from above. It is one of the most photographed spots in the Cyclades, and photographs genuinely do not do it justice.
How to Get to Kleftiko
Kleftiko cannot be reached on foot. There are no roads, no hiking paths, no way to access the site from land. The only way to visit is by boat.
This is not a limitation — it is what makes Kleftiko special. The moment you arrive, you know you have earned the view. And because access is by boat only, the site is never overcrowded the way a road-accessible beach would be.
From Adamas (the main port of Milos), Kleftiko is approximately 45 minutes by boat along the southern coast. Poseidon Milos departs from Agia Kyriaki Beach, on the southern coast, which cuts the journey time and lets you spend more time at the sites themselves.
Half Day or Full Day — Which Cruise is Right for You?
Poseidon Milos offers two cruise options that include Kleftiko. Choosing between them depends on how much time you want on the water and how many places you want to see.
5-Hour Cruise — Kleftiko & Sykia
The 5-hour Kleftiko & Sykia cruise is the perfect half-day on the water. You depart from Agia Kyriaki Beach, stop at Gerakas and Tsigrado on the way, spend a long swimming stop at Kleftiko, and finish at the extraordinary Sykia sea cave.
This is the right choice if you want to focus on the two iconic cave sites without spending a full day at sea. It is also ideal for families with younger children, or if you have other plans for the afternoon.
Duration: 5 hours Includes: Captain, fuel, snacks, soft drinks, water, snorkelling masks Capacity: Up to 9 people (8.55m inflatable) or 6 people (6.10m inflatable)
8-Hour Cruise — Kleftiko, Sykia, Polyaigos & Kimolos
The 8-hour full-day cruise is the grand tour. After Kleftiko and Sykia, you continue to the uninhabited island of Polyaigos — the largest uninhabited island in the Cyclades — where you swim at Blue Waters (some of the most transparent water in the Aegean) and the double beach of Myrsini. You finish at the traditional island of Kimolos, visiting the picturesque harbour of Psathi and the sea caves of Goupa Kara.
This is a full day at sea, visiting four distinct destinations. It is the best single day you can spend in this part of Greece.
Duration: 8 hours Includes: Captain, fuel, snacks, soft drinks, water, snorkelling masks and flippers Capacity: Up to 9 people (8.55m inflatable) or 6 people (6.10m inflatable)
What's Included on Every Cruise
Both Poseidon Milos cruises include everything you need for a day at sea:
- Experienced licensed captain
- Fuel
- Snacks, soft drinks and water throughout the day
- Snorkelling masks (and flippers on the 8-hour tour)
- Full sun awning for shade
- Freshwater shower on board
- Comfortable bucket seats
- Refrigerator, GPS plotter, electric anchor, USB charging, radio
You bring: sunscreen, a towel, a swimsuit and your camera.
When is the Best Time to Visit Kleftiko?
Kleftiko is accessible from May through October, weather permitting. The sea conditions on the southern coast can be affected by the Meltemi wind in high summer, so the timing of your visit does matter.
May and June are excellent. The sea is calm, the light is extraordinary in the late morning and early afternoon, and the boats are not yet fully booked. Water temperature is around 20–22°C — perfect for swimming.
July and August are peak season. The weather is at its best but boats fill up fast. Book at least one week in advance. The Meltemi can occasionally affect departure times, but your captain will always reroute to keep you safe.
September is arguably the best month. The sea is at its warmest (24–25°C), the crowds thin out significantly, and the light in September has a particular warmth and clarity that makes the white rocks of Kleftiko look almost luminous. Late-season bookings are often available with shorter notice.
Practical Tips for Visiting Kleftiko
Book early in peak season. July and August dates fill up, especially for private tours. If you have specific dates, book as soon as you arrive on the island.
Bring more sunscreen than you think you need. The southern coast is fully exposed and the reflection off the white rock at Kleftiko is intense. Factor 50 on your face is not excessive.
Wear water shoes if you have them. The rocks at Kleftiko are beautiful but uneven. Water shoes make the swimming stops more comfortable.
Bring an underwater camera or phone case. The caves at Kleftiko and the interior of Sykia are among the most photogenic places in the Cyclades. A waterproof case for your phone costs very little and makes a significant difference.
The caves are safe to swim into. The Kleftiko caves are navigable at water level and have multiple exits. You do not need to be an expert swimmer — if you are comfortable in open water, you can explore the caves.
How to Book
Poseidon Milos departs from Agia Kyriaki Beach on the southern coast of Milos. Both cruises can be booked directly by phone or WhatsApp.
Phone / WhatsApp: +30 698 793 0867 Email: poseidonmilosboats@hotmail.com Office: Adamantas, opposite the Shell petrol station
For the 5-hour Kleftiko & Sykia cruise, see full details and book here.
For the 8-hour full-day cruise to Kleftiko, Polyaigos and Kimolos, see full details and book here.
Poseidon Milos has been running boat rentals and cruises from Milos since 2018. All cruises are operated by licensed captains with full safety equipment on board.