Mount Ijen or more in the know with the Ijen crater is a mountain that is still active. Ijen crater has a height of 2443 meters above sea level, walled caldera between 300-500 feet tall and has 4 times erupted in 1796, 1817, 1913 and 1936. Ijen Crater complex is comprised of the Ijen volcanic craters and highlands. Mount Ijen area is located in the three districts, namely: Bondowosa, Situbondo and Banyuwangi.
In the region there is sulfur mining, Ijen Crater is indicating active volcano. While at the Ijen crater, visitors can see the sulfur miners busy carrying piles of sulfur on their backs and the path is steep. Ijen crater lake is the center of the largest in the world, which could produce 36 million cubic meters of sulfur and hydrogen chloride with an area of approximately 5466 hectares. The Ijen crater has outstanding natural beauty with turquoise-colored sulfur lakes with dramatic and elegant touch. Ijen lake has a zero acidity and has a depth of 200 meters, strong acidity could dissolve clothing and human fingers.