Best caves in Sifnos island
Sifnos is a quiet Cycladic island with steep cliffs, clear water and a long history that reaches back to ancient mines and sanctuaries. Its coastline and hills hide a small but interesting mix of caves, from sacred grottoes above Kamares to underwater caverns that divers explore near Chrysopigi and the western shores.
Below you will find the top 5 best caves in Sifnos island, with clear information on location, access, and safety so that you can plan real visits, not just look at photos from a distance.
Table of Contents
1. Cave of the Nymphs, Korakies
A. Cave information
The Cave of the Nymphs is a small natural cave carved into the limestone cliffs above the bay of Kamares, in the area called Korakies. In antiquity it was used as a sanctuary to the nymphs, the nature spirits of springs and groves, and there is still an ancient inscription on the rock that reads in Greek “Sanctuary of the Nymphs”. The cave itself is around ten metres deep, with a low entrance and a small natural basin inside where water gathers after rain.
The setting is peaceful, with views down to the port and the valley, and you can easily imagine why people in the past chose this quiet hollow in the rock for worship and rest. Even though it is not a show cave with lights or steps, it offers a real feeling of history and a direct link to the ancient religious life of Sifnos. It is a good stop for travellers who enjoy light hiking, archaeology and calm spots away from the beach bars.
B. Location
The Cave of the Nymphs lies on the slopes above Kamares, the main ferry port of Sifnos, in the locality of Korakies. It is reached from the area of the old aqueduct, on the side of the valley that rises towards the inland villages, below the larger formation known as the Black Cave.
From Kamares you look inland and slightly to the right side of the valley; the cave sits in the rocky cliff line that frames the settlement.
C. How to get there
From Kamares square you can walk up the road towards the aqueduct area in about twenty minutes at an easy pace. Local paths lead from the aqueduct up towards the cliff, where a short side path takes you to the cave entrance; follow signs or ask a local, as the last part is on a simple trail. The walk is not long but it does involve some uneven ground and short uphill sections, so light walking shoes are better than flip flops.
If you prefer to save time you can drive a short way up the road above Kamares and park close to the trailhead, then walk the last stretch on foot.
D. Safety and things to carry
The path is not difficult, but there are stones and loose gravel, so you should wear closed shoes with a good grip and watch your footing near the cliff. The cave interior is low and a bit uneven, therefore it is wise to bring a small torch and move slowly so that you do not bump your head. In summer the sun on the slopes is strong, so carry drinking water, a hat and sunscreen, even for a short walk.
Because this is an archaeological and sacred site, you should treat the rock and the inscription with respect, avoid touching carvings and do not leave any rubbish in or near the cave.
2. Mavri Spilia, the Black Cave above Kamares
A. Cave information
Mavri Spilia, which means Black Cave, is a dramatic rock formation high above the bay of Kamares. Today it is best known as a climbing crag, with solid grey and red limestone walls that hold a set of bolted sport climbing routes. The cliffs offer around fourteen routes between about twelve and fifteen metres in height, with grades from about five C to six C plus, which makes the sector interesting both for fit beginners and for more experienced climbers who want technical moves on small holds.
The cave and its overhangs catch the morning light, and the views across the sea and down to the port are wide and very rewarding. Hikers also enjoy the area, because it sits on the slopes used in longer walks between Kamares, Agios Eleftherios and Apollonia, and it feels wild even though the village is close. For many visitors, Mavri Spilia is less about going inside a closed cave and more about standing under an impressive rock amphitheatre and feeling the scale of the landscape around Kamares.
B. Location
Mavri Spilia is located on the steep hillside south east of Kamares, roughly above the valley that leads inland from the port. It sits higher than the Cave of the Nymphs, on the same side of the valley, and forms a dark recess in the cliff that you can see from lower down if you know where to look.
The crag is about eight hundred to one thousand metres walking distance from the main parking area of Kamares, but with a significant climb in elevation.
C. How to get there
On foot, you start from Kamares square and follow the road towards Apollonia for around one hundred and fifty metres, then turn into local streets such as Dexamenis and Pigis before joining a dirt track and a marked trail. From there a narrow path climbs across the slope, crosses a small stream and then continues upwards towards the obvious rock band where the routes are bolted. The whole walk from the square to the cave area is about nine hundred and fifty metres and normally takes thirty to forty minutes, with frequent stops to look back at the bay.
You can also drive a very short distance out of Kamares to reduce the walking, but the final part always requires a hike on footpaths, so plan for a small adventure rather than an instant viewpoint.
D. Safety and things to carry
The terrain around Mavri Spilia is steep and rocky, so you should wear proper walking or approach shoes and avoid going in flip flops or smooth soles. If you are planning to climb, you need suitable equipment such as a harness, helmet, belay device, rope of at least forty metres and quickdraws, and you should only climb if you know how to use them safely or are with an experienced guide. Even if you only go to look, it is sensible to bring water, a hat and sun protection, as the path is exposed and the Sifnos sun is strong in summer.
Rockfall is always a small risk in such terrain, so do not sit directly under other climbers, avoid pulling on loose blocks and keep children under close supervision near the cliff edge.
3. Chrysopigi underwater caves and rock arches
A. Cave information
The Chrysopigi peninsula on the south east coast of Sifnos is famous for its white monastery that stands on a rocky islet connected to the land by a small bridge. Beneath and around this rock, the sea has carved underwater caves, arches and ledges that attract snorkellers and divers. The clear water, bright light and contrast between white rock and deep blue sea make this one of the most photogenic swimming areas on the island.
Divers describe sections of wall with small caverns and overhangs where fish shelter, along with channels where you can swim through when the sea is calm. The setting is spiritual and dramatic, combining a major pilgrimage church with wild rock shapes and the sound of waves on the cliff. Even for visitors who stay on the surface, floating near the rocks and looking down on the underwater relief gives a good sense of the hidden shapes below.
B. Location
Chrysopigi lies between Faros and Platis Gialos, on the south east side of Sifnos. The monastery stands on a low rocky headland that projects into the sea, with the beach of Apokofto to the east and another small cove on the west side.
The underwater caves and arches are found around the base of this peninsula, in the deeper water near the rocks where the sea has cut into the cliff.
C. How to get there
You can reach Chrysopigi by car, scooter or bus from the main villages; from Apollonia it is a short drive on the road towards Platis Gialos, with clear signs to the monastery. After you park, a short walk leads down to the church and to the rocks where people swim and sunbathe. Confident swimmers with fins and a mask can explore the edges of the peninsula directly from the rocks or from the nearby beach when the sea is flat and there is no strong wind.
For real cave exploration below the surface it is better to go with a local diving centre, which can take you by boat to the most suitable spots and guide you safely in and out of underwater hollows.
D. Safety and things to carry
The rocks around Chrysopigi are beautiful but can be sharp and slippery, so sea shoes are very helpful for entering and exiting the water. The water gets deep quite quickly and there can be waves or swell, so only strong swimmers should move away from the easy entry points, and you should never jump without checking the depth. For surface exploration bring a mask, snorkel and fins, along with a light rash vest or T shirt for sun protection while you float.
If you go diving, follow the guidance of certified instructors, use proper equipment and avoid entering enclosed underwater spaces beyond your training level. In all cases carry drinking water, as the sun reflects off sea and rock and there is little natural shade near the monastery.
4. Heronissos sea caves in the north of Sifnos
A. Cave information
Heronissos, sometimes written Cheronissos, is a tiny fishing village on the remote northern tip of Sifnos, set around a narrow bay with bright white houses. The cliffs and headlands near the bay hide a series of sea caves and overhangs that are explored on small boat trips, often promoted as Heronissos cave glow or similar adventures. In the late afternoon light the interior of these caves takes on a soft glow as sunbeams bounce off the water and up onto the rock walls.
The caves here are not huge caverns, but rather a chain of marine hollows, arches and cutbacks that give a sense of drama to the already wild coastline. For many visitors the experience is less about ticking off a single named cave and more about gliding in a small boat past sheer rock, watching colour changes in the sea and stopping for quiet swims in hidden coves.
B. Location
Heronissos is located at the far north of Sifnos, far from the main port and resort beaches. The sea caves lie along the rocky shoreline just outside the bay, normally reached as part of short local cruises that start in or near Heronissos.
The setting feels remote, with open Aegean views and few buildings once you leave the small village behind.
C. How to get there
You can drive to Heronissos from Apollonia by following the road north across the island; the journey takes around half an hour and ends in a small parking area above the bay. From there you walk down to the waterfront, where local operators and small boats may offer trips along the coast in high season, sometimes including the cave glow route. It is also possible to reach the area as part of longer circumnavigation cruises that depart from Kamares or Platis Gialos and include various stops around Sifnos.
Booking in advance is a good idea in the busiest months, as boat sizes are small and trips depend on sea conditions and wind direction.
D. Safety and things to carry
Sea cave trips always depend on the weather, so you should listen carefully to the captain and accept that some caves may not be safe to enter if there is swell or strong wind. Bring a light jacket, as it can feel cooler on the water, along with sun protection, a hat and sunglasses, because the reflection from the sea is strong even in the late afternoon. A dry bag for your phone and camera is useful, especially if the boat goes partly inside caves where spray may reach you.
If you plan to swim, pack swimwear, a towel and simple sea shoes, as some of the small coves have pebbles or sharp rocks rather than soft sand.
5. Western coastline underwater caves near Faros and Vathi
A. Cave information
The western and southern coasts of Sifnos, especially the areas around Faros, Vathi and the rocky sections between the main beaches, offer several diving and snorkelling spots with small underwater caves and interesting rock formations. Diving guides describe rocky reefs, sandy patches and little caves where octopus, groupers and moray eels find shelter, all in clear Aegean water. These sites are not famous show caves with names, but together they form a network of marine hollows that attract both beginners and more advanced divers.
Many local boat tours follow the western coastline specifically to show guests hidden coves and sea caves that are only accessible from the water, making this side of the island a favourite for people who enjoy in water exploration. The mixture of calm bays like Vathi and rougher stretches of cliff means that there is almost always somewhere suitable, depending on the wind.
B. Location
These underwater caves and coves are scattered along the west and south west shores of Sifnos, with convenient starting points at Vathi, Platis Gialos and sometimes Kamares. Faros on the opposite coast also serves as a base for some dive trips, with access to rocky reefs and small caves nearby.
Exact dive spots are usually chosen on the day by guides, based on sea conditions, visibility and the experience of the group.
C. How to get there
The easiest way to visit these caves is to book a diving or snorkelling trip with a licensed centre on Sifnos, many of which are based around Kamares and Apollonia, and operate by boat along the coast. They provide all necessary equipment and transport you directly to suitable sites near Vathi, Faros or other parts of the western shoreline. Some boat rental companies and RIB cruises also include stops at sea caves and hidden coves as part of full day routes, especially along the western coast.
You do not normally visit these sites on foot, because they are under the surface or at the base of steep cliffs, so planning a water based excursion is essential.
D. Safety and things to carry
For diving or snorkelling you must always follow the instructions of professional guides, stay within your certification level and avoid entering overhead environments unless you are properly trained. The Aegean is usually calm in summer, but currents and swell can still appear, so never snorkel alone in remote coves. Bring any personal items that make you more comfortable in the water, such as your own mask if you have one, a rash vest and reef safe sunscreen.
On the boat you will want a hat, sunglasses, a towel and perhaps a light jumper for the breeze, plus a reusable water bottle, as trips often last several hours in the sun.