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See Api Biru (Blue Fire) at Kawah Ijen Volcano, Indonesia

The phenomenon has long been known, but midnight hiking tours are a more recent offering. 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. Ijen is the largest blue flame area in the world. Local people refer to it as Api Biru (Blue Fire). The other location at which blue fire can be seen is in Dallol Mountain, Ethiopia
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