The World Record of ‘largest acidic volcanic crater lake’ has been achieved by Kawah Ijen from Banyuwangi, East Java, Indonesia.

Kawah Ijen has deep turquoise waters and bright sulfur deposits along with regular bursts of blue flame ignited sulfuric gas. It is located in the Ijen volcano complex which is a group of strato volcanoes. It is inside a larger caldera Ijen, which is about 20 kilometers wide. Ijen volcano has this one-kilometer-wide turquoise-colored acidic crater lake.