Stories of Discovery & Wonder

Santorini Volcano & Hot Springs Boat Tour — Nea Kameni Craters and Thermal Swim

A short boat run from Fira takes you to Nea Kameni’s smoking craters and the warm mud baths of Palaia Kameni. Expect a brisk hike to active vents and a brief thermal swim off the boat—an intense, three-hour encounter with Santorini’s volcanic power.

Fira, Santorini•

3 hours

•By Adventure Collective•October 2025

The Experience

The boat slips away from Fira's old port and the island's white walls fall astern as the caldera cliffs press closer. In minutes the sea opens to the black rim of Nea Kameni; steam lifts from fissures like a sleeping beast waking. Guests step onto a stony path, where scorched rock and sulfur-scented air make clear this land is still very much alive.

Before You Go

Bring water and shade

The volcanic trail offers almost no shade—carry at least 1L of water and wear a hat to avoid sun exposure.

Wear sturdy shoes

Loose pumice and volcanic rock are sharp and unstable; closed-toe shoes with good grip are recommended for the crater path.

Be ready to swim

You’ll descend boat stairs and swim roughly 30 meters into the hot-spring inlet—be honest about your swimming ability and wear a flotation aid if unsure.

Protect skin and camera gear

Thermal water and sulfur can irritate sensitive skin and corrode camera equipment—rinse off afterwards and use waterproof protection for electronics.

Local Knowledge

Hidden Gems

•Climb the less-trafficked east rim early in the morning for quieter views of fumaroles and layered lava flows.
•Seek out the shallow mud coatings in Palaia Kameni—locals use them briefly for skin benefits before rinsing off in the sea.

Wildlife

•Mediterranean gull
•Loggerhead sea turtle (Caretta caretta)

Conservation Note

The volcanic islets are geologically fragile and ecologically sensitive; stick to paths, take all trash back to Fira, and avoid disturbing vents or wildlife.

Santorini’s caldera formed during major eruptions, including a massive Minoan eruption around 1600 BCE that reshaped the island and influenced regional cultures.

What to Bring

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Closed-toe trail shoesEssential

Protects feet on sharp, unstable volcanic rock while climbing to the crater rim.

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Swimsuit and quick-dry towelEssential

Wear under clothing for the thermal swim and to dry off quickly on return to the boat.

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Reusable water bottle (1–2L)Essential

Hydration is critical in the exposed caldera heat; refill before boarding in Fira.

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Waterproof bag or phone pouch

Keeps electronics and documents dry when you descend boat steps and swim to the hot springs.

Common Questions

How long is the tour and how much time do you spend on the islets?

Total duration is about 3 hours: ~10 minutes boat transfer to Nea Kameni, ~75 minutes to explore the crater, then ~30 minutes at Palaia Kameni for swimming before returning to Fira.

Do I need to be able to swim?

Yes — you will need to descend boat stairs and swim around 30 meters to reach the warm spring inlet; a basic swimming ability is required.

Are there facilities on the islets?

There are no facilities on Nea Kameni or Palaia Kameni; bring water, sun protection, and any personal essentials from Fira before departure.

Is the crater area dangerous because of volcanic activity?

The area is monitored and visits stay on marked paths, but fumaroles emit hot gases and some ground can be unstable—follow guides’ instructions and avoid touching vents.