Walks and treks

Ijen Crater

Indonesia Jawa Timur Wongsorejo

Ijen Crater
Photo: Jean-Marie Hullot, CC BY-SA 2.0, via Wikimedia Commons

A volcano in eastern Java with a turquoise acid lake in its crater, where sulphur miners carry heavy loads by hand. Before dawn, 'blue fire', burning sulphur gas, can be seen from the crater floor.


Hikes start around 1 am from Paltuding; it takes about 2 hours up. Gas masks are essential and provided by guides. Access closes when gas levels are high.

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