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LiveScience
LiveScience
Sascha Pare

Kawah Ijen: The volcano in Indonesia that holds the world's largest acidic lake at its heart

Earth Indonesia Java
View of Kawah Ijen crater lake from the top of the volcano. The lake's waters are bright turquoise and there is a plume of gas rising to the left.
QUICK FACTS

Name: Kawah Ijen crater lake

Location: East Java, Indonesia

Coordinates: -8.05796494233988, 114.2415831801649

Why it's incredible: The volcano's crater lake is as acidic as car battery acid, yet it still hosts life.

Kawah Ijen is a giant, active volcano on the island of Java with a crater that contains the world's largest acidic lake. The water has a pH lower than 0.3 in parts of the lake where hydrothermal fluids rise up from inside Earth's crust, filling the water with minerals, as well as sulfuric and hydrochloric acids.

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