The bluefire

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Since National Geographic mentioned the electric-blue flame of Ijen, tourist numbers increased.[7] The phenomenon has occurred for a long time, but beforehand there was no midnight hiking. A two-hour hike is required to reach the rim of the crater, followed by a 45-minute hike down to the bank of the crater. The blue fire is ignited sulfuric gas, which emerges from cracks at temperatures up to 600 °C (1,112 °F).

The flames can be up to five meters (16 feet) high; some of the gas condenses to liquid and is still ignited.[8][9] It is the largest blue flame area in the world and local people refer to it as 'Blue Fire'. (Source : wikipedia)