The Ijen volcano complex in East Java comprises a cluster of composite volcanoes renowned for several distinctive features. These include the unique blue flames, a highly acidic turquoise crater lake, and the physically demanding sulfur extraction operations.
Nestled within the vast caldera known as Ijen, spanning approximately 20 kilometers in width, this complex is dominated by the Gunung Merapi stratovolcano, which stands as its highest peak.
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