Mount Ijen is one of Indonesia’s unique trekking destinations.

It is famous for electric blue lava-like rivers of light a.k.a the “blue flames” that is best seen when it’s still dark. The trek starts before sunrise and passes through sulfur mines before reaching the crater lake.

Along the way, you’ll see miners carry huge loads of sulfur rocks back to the base camp, and breathtaking views of the volcano.

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IN PHOTOS: Marcos takes a sunrise hike at Mount Ijen volcano, infamous for its blue flames and sulfur mines.