Ijen Crater, also known as Kawah Ijen, is a volcanic crater located in East Java, Indonesia. It is famous for its blue sulfur flames and turquoise acid crater lake, the largest acidic lake in the world. The hike to the crater takes about 2 hours and starts early in the morning to witness the blue flames. Miners extract sulfur using traditional methods, and visitors can interact with them. The stunning views and unique natural phenomena make Ijen Crater a must-visit destination for adventure and nature lovers.

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