Mount Ijen Crater (or commonly abbreviated to Ijen Crater) is one of the active volcano in East Java. This mountain is part of the National Park Purwo Alas, the national park located in the District of Banyuwangi, East Java. However, administratively, Ijen Crater is divided into two districts, namely District Bondowoso and Banyuwangi, East Java.Ijen Crater has a height of about 2443 meters above sea level (asl) and has erupted several times, namely in 1796, 1817, 1913, and 1936. As a result of eruptions, a crater lake wide open with the magic of sulfur (sulfur) in it. That said, because the vast capacity of water and sulfur in the crater, Ijen Crater is one of the world's largest crater lake.
The size of the caldera about 20 miles. Size of the crater itself is around 960 meters x 600 meters with a depth of 200 meters. The crater is located at depths greater than 300 meters beneath the caldera wall.