Ijen Crater locates in the middle of the nature reserve area between Bondowoso and Banyuwangi regencies, East Java. Ijen crater and the lake are inexperienced at an altitude of 2.368 meters high from sea level. It is a walled volcanic crater with a height of 300-500 meters. Near the crater is a lake with zero degrees of acidity and 200 meters deep. It is Acid sturdy enough to dissolve covering human fingers.