Mount Ijen, famous for its Ijen Crater, is one of the active volcanoes in Java. Standing at 2,443 above sea level, the crater is surrounded by a wall as tall as 300-500 metres. The Ijen Crater is frequently visited by travelers from both domestic and international. The area is located between three regencies; Situbondo, Bondowoso and Banyuwangi.

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Since National Geographic mentioned the electric-blue flame of Ijen, tourist numbers increased. 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. It is the largest blue flame area in the world and local people refer to it as 'Blue Fire'.