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Ijen

Ijen, East Java, Indonesia
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Visiting the Blue Flames & the World's Largest Acidic Lake Sempol  Indonesia

Visiting the Blue Flames & the World's Largest Acidic Lake

Sights at the Ijen Crater include bright blue flames from burning sulfur gasses seen only in the dark, sulfur vents spewing yellow liquid molten sulfur which is collected and hauled out by miners, and the warm acidic aqua blue lake that fills the crater.