Nisyros

Nisyros is a small volcanic island in the Dodecanese archipelago of the South Aegean, Greece, notable for its large central caldera and ongoing hydrothermal activity. The island’s volcanic features make it a distinctive geological destination in the Aegean.

A primary highlight is the island’s large crater complex - the Stefanos caldera - where visitors can walk near fumaroles and steaming vents. Small port villages such as Mandraki provide access and basic services, while hillside settlements like Nikia offer viewpoints over the caldera and surrounding sea.

The island is the product of volcanic activity; the visible caldera and fumarolic fields were formed by successive eruptions and collapse events. Volcanic activity has been recorded in historical times and the island retains active hydrothermal features rather than frequent high-energy eruptions.

Geographically, Nisyros lies in the southern Aegean Sea among the Dodecanese islands, close to Kos and other isles, and is reached by ferry from neighboring islands. The landscape combines rocky volcanic interior, steep caldera walls, and low-lying coastal settlements.

• Transport: Ferry services connect the island with Kos and other Dodecanese islands, with schedules varying seasonally.
• Safety: The volcanic crater area features active fumaroles and warm ground; visitors should follow marked paths and local safety guidance.

What to See #

• Stefanos crater: A large volcanic crater with steam vents and fumaroles at the island's interior, accessible on foot from nearby villages and one of the island's main visitor attractions.
• Mandraki: The island's main port and administrative settlement, offering ferry connections, small shops, and boat access to coastal sites.
• Nikia: A traditional hillside village known for whitewashed houses and views over the caldera and the Aegean Sea.