Ijen Crater is the biggest crater lake in East Java. The sulfur crater lake lies between a natural dams of deeply etched rock. It is 200 meters deep and contains about 30million cubic meters of steaming acid water, shrouded in a smelling swirling sulfur cloud. Inside the crater the different color and size of stones are found. Indeed the crater of Ijen is beautiful garden of stone as well.
The view of sulfur miners who climb and go down to the crater is also amazing. A man puts about 10 kg of yellowish stone in to his basket, before he descends the mountain slope to sell his load, carrying the same basket, going in the same direction, digging the same mineral. It is the natural picture that can be seen everyday.
Ijen Crater lies in the centre of Ijen-Merapi Malang Reserve, which extends over much of the mountainous region directly west of Banyuwangi and borders on the Baluran National Park in the northeast. As at Mt. Bromo, the caldera is best viewed from the air. Fortunately, almost all commercial flights operating between Denpasar – Surabaya, Yogyakarta or Jakarta usually fly, if not directly over, then close by Ijen plateau, where the seemingly luminous blue/green crater lake forms an unmistakable landmark. It is beautiful scenery and located about 32 km to the north west of Banyuwangi.
The principal attraction at Ijen is the large Crater Lake that has much sulfur, which lies hidden between sheer walls of deeply furrowed rock at more than 200 meters. The Ijen crater itself lies at approximately 2,300 meters above sea level. It forms a twin volcano with the now extinct Mount Merapi. The enormous Crater Lake, which is 200 meters deep and covers an area of more than meters, a million square meters, contains about 36 million cubic meters of steaming, acid water.