Explore
Walk directly across the bubbling floor of a dormant but active hydrothermal volcano.
The Nisyros caldera is 4 kilometers wide. It formed during massive eruptions 25,000 and 15,000 years ago. Its centerpiece is the Stefanos Crater. You can safely explore this large crater floor on foot.
Entry costs €5 per adult. You will see steaming fumaroles and boiling mud up close. You must wear closed-toe shoes to protect your feet from the hot ground.
30-45 minutes€5 entry fee
Stefanos is the largest hydrothermal crater on Nisyros. It measures about 300 meters across and 27 meters deep. Visitors walk right on the steaming floor. Go early between 9:00 AM and 11:00 AM to beat the intense midday heat.
15-20 minutesShort trail walk
These smaller, twin craters sit near Stefanos. They provide a quieter viewing experience away from large tour groups. You will notice distinct mineral colors lining the rock walls. Follow the trail to the right of the restroom building for the best vantage point.
10-15 minutesDo not touch vents
Small openings in the crater floor release hot gases and hissing steam. Bright yellow sulfur crystals surround these active vents. Temperatures here approach 100°C (212°F). Do not touch the vents or the crystals, as they will cause severe burns.
