Table of Contents
1. Agios Stefanos Cave and Chapel
Cave information
Agios Stefanos is a tiny white chapel built right inside a coastal cave on the rocky shore near Galissas on the west side of Syros. The natural rock arch shelters the church and creates a magical setting where the sea almost touches the steps of the sanctuary. According to local legend, a fisherman called Stefanos was attacked by a huge octopus and promised to build a church to the saint if he survived, so the chapel was created in the cave as a sign of gratitude. Today visitors come for the peaceful atmosphere, the sound of the waves and the feeling that the cave is half church and half natural balcony over the Aegean. If you visit during the feast of Agios Stefanos in August, you can see the cave chapel come alive with local celebrations and traditional treats.
Location
The cave of Agios Stefanos is on the rocky coast close to Galissas beach, on the western coast of Syros. It faces the open sea, tucked into the cliffs below the hills that rise above Galissas village. Boat excursions that explore the northern and western shores of Syros also stop here so it is well known among people who love quiet coves and hidden chapels.
How to get there
Most visitors reach Agios Stefanos either on foot from Galissas or by sea on a small boat excursion. From Galissas you follow a marked coastal path that goes along the hillside and then down a steep rocky section towards the sea until you see the chapel in the cave below you. If you prefer to arrive by water you can join a daily cruise or private boat trip from ports such as Ermoupoli, Finikas or Kini that includes a stop at the cave chapel for swimming and photos.
Safety and things to carry
The last part of the footpath down to the cave is steep and can be slippery, especially if the ground is damp, so you should wear proper closed walking shoes and take your time. In summer there is little natural shade on the way, so carry water, sun cream and a hat, even if you plan to swim in the cool sea when you reach the cave. If you arrive by boat, check sea conditions and follow the crew instructions when getting on and off, as the rocks can be uneven and waves can be stronger on windy days. A small torch can also be useful inside the shaded parts of the cave chapel if you want to see details of the icons and the rock walls.
2. Pherecydes Cave near Ano Syros
Cave information
Pherecydes Cave is linked to the ancient philosopher Pherecydes of Syros, who is said to have spent his winters here in the sixth century before Christ, writing and thinking above the sea. The cave sits in a quiet, open landscape where the rock, sky and sea meet, so it has a special atmosphere for travellers who enjoy history and simple natural settings rather than tourist facilities. There is no built chapel inside, only rough rock walls and openings that frame views towards the horizon, which makes it easy to imagine a solitary thinker living here long ago. The spot is modest but very meaningful if you are interested in early Greek philosophy and you want to combine a short walk with a cultural stop on the way to Ano Syros.
Location
Pherecydes Cave is on the road that climbs from Ermoupoli towards Ano Syros, shortly after the small rural settlement of Kyperoussa. It lies on a slope that drops gently towards the sea, so from the cave you can look out over the blue water and the nearby countryside of central Syros. The site is inland rather than on a beach, which makes it a nice contrast to the coastal caves and sea coves of the island.
How to get there
You first travel towards Ano Syros by car or taxi and look for the area of Kyperoussa, where there is a small dirt track that leaves the main road. From there a short unpaved path leads gradually downhill to the cave, which is hidden in a rocky hollow above the sea. There are no formal visitor facilities, so you simply follow the path and basic signs to reach the entrance and explore the interior at your own pace.
Safety and things to carry
The ground around Pherecydes Cave is rocky and uneven, so comfortable walking shoes and a steady pace are important. Because there is very limited shade, especially in the middle of the day, you should bring water, a hat and sun protection, even though the walk is not very long. The cave itself is quite simple and not lit, so a small torch or the light on your mobile phone can help you see where you step and appreciate the rock shapes without straining your eyes.
3. Grammata and Gria Spilia Coves
Cave information
Grammata bay on the north west coast of Syros is famous for the inscriptions carved into its rocks by sailors over many centuries, while nearby Gria Spilia offers shady coves and overhangs that feel like small natural caves beside the sea. The name Grammata means letters and refers to the carved messages and prayers that date from classical antiquity through Roman and Byzantine times, when ships took shelter here from the strong northern winds. Many of the engravings are wishes and thanks to various gods for safe passage and they make the rocky walls above the tiny beach feel like an open stone archive. Close by, at Gria Spilia and the surrounding cliffs, you can swim under rock ledges and explore small hollows that add a sense of adventure to the bay.
Location
Grammata and Gria Spilia are in a remote section of the north west coastline of Syros, in the area known as Ano Meria. The two beaches sit within the same sheltered bay and are surrounded by steep rocky slopes with very little building, so the landscape feels wild and untouched. The archaeological area of the inscriptions is just behind the small sandy shore of Grammata, while Gria Spilia lies a short walk away within the same cove.
How to get there
The easiest way to reach Grammata and Gria Spilia is by boat, either on a day cruise from Ermoupoli or Finikas, or on smaller excursions that start from Kini. These trips usually combine several northern beaches such as Lia, Marmari and Grammata, and many include time for swimming and exploring the rock inscriptions. There are also hiking routes for experienced walkers that cross Ano Meria and descend to the bay, but they are longer and require good preparation and orientation.
Safety and things to carry
Because this area is remote and mostly reached by boat, you should carry all that you need for several hours, including water, snacks, sun cream and a hat. The rocks with inscriptions are fragile and part of an important archaeological site, so you must avoid touching or scratching the carvings and always follow any guidance given by your boat crew or guide. Good sandals or water shoes can make it easier to move between the beach and the rocky sections where the engravings and small cave like hollows are found.
4. Old Cave Beach also called Americanos
Cave information
Old Cave is a quiet beach in northern Syros that stands out because of the tall trees that give shade along the shore, a rare sight in this dry part of the island. Locals also call it the beach of the American, because an American economist named John Pierson began planting trees here in the nineteen sixties and worked for years to green the bare hillside. Although the name suggests a cave, the experience is a mixture of sheltered cove, forested slope and rocky coastline, which makes it feel like a hidden retreat between sea and pine. The beach is popular with people who like simple, natural camping and a peaceful base to swim, relax and watch the changing colours of the north west sea.
Location
Old Cave lies in Ano Meria, on the north west side of Syros, not far from Grammata bay. It is part of a larger area of about eight hundred acres where Pierson and his family planted and cared for trees, so when you arrive you notice how green it is compared with the bare hills around it. The shore itself is a small cove with trees almost reaching the water, which creates plenty of natural shade along the pebbles and sand.
How to get there
You can reach Old Cave either by sea or on foot. Boat excursions that leave from Kini often include stops at northern beaches such as Grammata and sometimes Old Cave, giving you a relaxed way to arrive and enjoy the scenery from the water. There is also a footpath that starts from the area of Kampos and eventually divides, with one branch leading to Grammata and the other to Old Cave, so experienced walkers can combine the two bays in one outing.
Safety and things to carry
Old Cave feels remote and there are no organised facilities, so visitors who plan to spend the day should bring water, food and anything else they may need. The path from Kampos is a proper countryside trail, so walking shoes, a hat and sun protection are important, especially in the warmer months. If you are thinking of free camping you should always respect local rules, leave no rubbish, and avoid disturbing the planted trees that make this place so special.
5. Sea Caves and Underwater Reefs of Northern Syros
Cave information
Beyond the named caves and coves, the northern and western coasts of Syros hide many small sea caves, arches and rocky holes that you can only reach from the water. The underwater world around the island includes reefs, drop offs and sea caves that attract divers from different countries, who come to explore both the geological formations and the marine life. Boat excursions often pass dramatic cliffs, small inlets and dark openings in the rock, where swimmers can snorkel along the walls and look into shallow caves lit by shafts of blue light. This makes northern Syros one of the most rewarding areas in the Cyclades for visitors who enjoy combining boat trips with exploration of hidden coastal features.
Location
Many of these sea caves are scattered along the coast between Kini and the remote beaches of Varvarousa, Aetos, Lia, Marmari, Grammata and Old Cave in the north. The area is known as Ano Meria and remains largely untouched, with steep rocky shores that have been shaped by wind and waves for centuries. Different caves and rocky overhangs are found close to the waterline, sometimes next to the small beaches and sometimes under sheer cliffs where there is no easy land access.
How to get there
The best way to experience these sea caves is to join a boat excursion or a sailing trip from ports such as Ermoupoli, Finikas or Kini. Daily cruises usually stop at a selection of northern beaches for swimming and may also bring you close to rock formations, arches and cave entrances so that confident swimmers can explore them carefully from the water. If you are a certified diver you can also contact the diving centre on Syros, which organises guided dives to reefs, shipwrecks and sea caves under professional supervision.
Safety and things to carry
Sea caves and rocky coves are beautiful but you must treat them with respect. Always listen to your skipper or dive leader, pay attention to sea conditions and avoid entering narrow caves if there are strong waves or if you are not a confident swimmer. Bring a mask and snorkel so that you can enjoy the underwater views near the caves, and consider a light wetsuit or rash vest if you plan to spend a long time in the water. Waterproof bags for your phone and camera are also useful on boat trips, especially when you approach low cave ceilings or rocky shorelines.