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natural mirror at Ijen volcano
Biggest Sulphur lake in the world.
The color of the water is a result of its extreme acidity and a high concentration of dissolved metals. It is the world's largest highly acidic lake with a measured pH as low as 0.5, caused by an inflow of hydrothermal waters charged with gases from a hot magma chamber below.
High: 2,799 m (9,183 ft)
Location: Banyuwangi Regency, Java, Indonesia