Mount Ijen is very well-known by tourist as Kawah Ijen with the blue flame and it is one of the most active volcano in Indonesia. Kawah Ijen or Ijen crater has 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. Ijen crater is comprised of Ijen volcanic craters and highlands. This Kawah Ijen lies in East Java area and the location exactly is in 3 districts area, they are: Bondowoso, Situbondo and Banyuwangi district.
This active volcano has sulfur mining indicates as active volcano with magma under the ground. When visitor reach on top of mount Ijen, they can see the sulphur miners working, busy carrying piles of sulphur on their backs with steep path. The lake of Ijen is centre of the largest volcano sulphur in the world. That could produce 36 million cubic meters of sulfur and hydrogen chloride with an area of approximately 5.466 hectares. Mount Ijen has outstanding natural beauty with turquoise color sulphur lakes with dramatic and elegant touch. The Ijen lake has zero acidity with the depth of 200 meters, strong acidity could dissolve clothing and human fingers as well.