Palea Kameni Hot Springs Santorini | What to know before you swim
Just off Santorini’s coast, tucked in the shadow of a volcanic islet, lie the warm, rusty waters of the Palea Kameni Hot Springs. Most caldera cruises will stop here, letting you swim straight off the boat into sulfur-rich shallows that stay warm year-round. The orange tint? That’s iron oxide from underwater vents. The mud here is said to help the skin, but don’t expect a spa kind of treatment, this is nature doing its thing. It's more float-and-feel than soak-and-sip. And yet, drifting in this geologically active pocket of the Aegean, surrounded by caldera cliffs, it’s easy to see why this short stop is one of the most memorable parts of a Santorini cruise.
What Makes Palea Kameni Hot Springs Special
It has volcanic origin
These springs were formed nearly 2,000 years ago after volcanic eruptions gave rise to Palea Kameni island. The water is naturally heated underground by lingering geothermal activity, holding steady at around 30–35°C.
Mineral-rich waters with old-world healing reputation
The murky orange tint comes from minerals like sulfur, iron, and manganese. These elements are long believed to ease joint pain and skin conditions like eczema or psoriasis. While it's not a cure-all, many visitors say the warm, slightly fizzy water feels soothing.
You’ll have to swim to get there
There’s no dock here. Boats anchor just outside the cove, and you’ll swim about 30–50 meters through cooler Aegean waters before feeling the temperature rise. There are no pavement or railings here, it'll be just you, the sea, and a patch of warm earth-fed water.
The setting is quite dramatic
Jagged volcanic cliffs frame the cove in streaks of red and black, while the water shifts between copper and turquoise. Look up and you’ll spot the tiny whitewashed chapel of Agios Nikolaos perched against the rock.
What’s it like to swim in Palea Kameni Hot Springs?
The water and its properties
The springs stay naturally warm, about 30 to 35°C but since they mix with the surrounding Aegean, temperatures can shift as you move around. The water is a rusty orange thanks to minerals like sulfur and iron, and it has a faint, eggy smell. It’s not overpowering, just something you’ll notice. Many say the warm water feels good on the skin, though it’s not exactly spa-like.
The swimming experience
Your cruise boat won’t dock, you’ll jump or climb down into open sea and swim 30 to 50 meters to reach the cove. The water gets warmer as you go. It’s not deep, usually waist- to chest-high, but it’s better suited for confident swimmers. Some cruises offer pool noodles or floaties if you’re unsure. You’ll tread water, float around, maybe rub a little of that mineral-rich mud on your arms.
Is it safe and clean?
Yes, it’s safe, but the minerals can stain light-colored swimsuits and towels. If you’re sensitive to sulfur or have breathing issues, it’s worth checking with your guide before diving in. The water is not dirty, it’s just natural. Cruise staff usually give a heads-up about what to expect, and most visitors are in and out within 20 minutes, feeling a little warmer and a lot more adventurous.
Plan your visit
Palea Kameni Hot Springs can only be reached by boat. Most Santorini caldera cruises include a 20–30 minute stop here.
Boats anchor a short distance offshore, near the shallow cove where the springs rise.
Cruises typically depart from Vlychada Marina, the Old Port of Fira, or Athinios, depending on tour type.
Some private catamarans offer longer or more flexible stops, often paired with Nea Kameni or Thirasia.
Late spring (May–early June) and early autumn (September–October) offer comfortable water temperatures without the peak crowd.
July–August is the busiest, and while the hot springs are still enjoyable, the midday heat can feel intense.
The experience depends on cruise timing. Midday stops are most common. Check if your tour includes swimming access.
Wear a dark or older swimsuit, the mineral-rich water (especially sulfur and iron) can stain light fabrics.
Pack a towel and dry change of clothes for after the swim. Some luxury cruises do offer towels.
Bring easy slip-on shoes for the boat, but swim barefoot, it’s all shallow silt and rock. A waterproof phone pouch or dry bag is handy if you plan to wade ashore.
If you're prone to skin sensitivity, check with your doctor beforehand, the sulfur content may cause irritation for some.
Frequently asked questions about Palea Kameni Hot Springs
You can only get there by boat. Most Santorini cruises include a short swimming stop near the springs, usually anchoring a short distance from shore.
The temperature ranges from 30–35°C, depending on the season. It’s not hot like a spa, but noticeably warmer than the surrounding sea.
You should be a confident swimmer. The swim from the boat is around 30–50 meters. Some tours offer floats if needed.
The sulfur and iron are generally safe and even considered therapeutic. That said, people with very sensitive skin may experience mild irritation.
Wear a dark swimsuit, light-colored fabrics often get stained from the mineral-rich water. Bring a towel and a change of clothes.
No, Palea Kameni is mostly uninhabited. There are no restrooms, changing rooms, or shops, everything happens onboard your cruise.
Most cruises allow 20–30 minutes here. That includes the swim to and from the boat, so you’ll have about 10–15 minutes in the springs.
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