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The sulfuric lake of Kawah Ijen Mountain's cauldron.

Mount Ijen Crater, the Largest Blue Flame Area and Largest Acidic Lake in the world

  The Ijen volcano complex at the eastern end of Java consists of a group of small stratovolcanoes constructed within the large 20-km-wide Ijen (Kendeng) caldera. The north caldera wall forms a prominent arcuate ridge, but elsewhere the caldera rim is buried by post-caldera volcanoes, including Gunung Merapi stratovolcano, which forms

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