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

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Indonesia 's Kawah Ijen volcano has a crater that contains the world's largest acidic lake.

The water has a pH of 0.3 in parts of the lake where hydrothermal fluids rise up from inside Earth 's crust.

The minerals and acids in the lake give the water its seemingly artificial turquoise color.

Despite conditions that would dissolve human skin, the lake is home to a small community of microbes.