Mount Ijen or more well known by tourist as Kawah Ijen. It is one of the mountain in Indonesia that is still active. Kawah Ijen or Ijen crater has a height of 2.443 meters above sea level. With the walled caldera between 300-500 feet tall and it has 4 times erupted in 1796, 1817, 1913 and 1936. The Ijen crater is comprised of Ijen volcanic craters and highlands. This Kawah Ijen lies in East Java part, located exactly in the three districts area and they are: Bondowosa, Situbondo and Banyuwangi district.
This active volcano has sulphur mining and the mountain indicates as an active volcano with magma under the ground. When visitor reach on top of mount Ijen, they can see the sulphur miner working, busy carrying piles of sulphur on their backs and the path is steep. The lake of Ijen is centre of the largest volcano sulphur in the world. That could produce 36 million cubic meters of sulphur and hydrogen chloride with an area of approximately 5.466 hectares. Mount Ijen has outstanding natural beauty with turquoise colour sulphur lakes with dramatic and elegant touch. The Ijen lake has a zero acidity and has a depth of 200 meters, strong acidity could dissolve clothing and human fingers as well.