Ijen Crater Banyuwangi, East Java is the most wonderful crater in Indonesia. About 6 hours drive by car from Bromo mountain. It has a biggest crater lake that produced huge sulfur from the bottom crater and lies between a natural dams of deeply etched rock. it has 200 meters depth and contains about 36million cubic meters of steaming acid water, shrouded in a smelling swirling sulfur cloud. Inside crater, different color and size of stones are found. Indeed the crater of Ijen is beautiful garden of stone as well.
Kawah Ijen or Ijen crater is the only crater in Indonesia which has a natural phenomenon "blue fire". In the world, there are only two places that have the Blue Fire. In addition to Indonesia, there is also a blue fire in Iceland.
Blue fire is happening because of the heat of the crater of Ijen combined with sulfur to create the effect of blue flame on the surface. This phenomenon can only be seen before sunrise.
Trekking to the summit of Mount Ijen to see blue fire began at midnight (around 2:00 dawn) of Pos Paltuding (the last post for all the Ijen crater tour to make the climb) with a long climb to the crater of Mount Ijen about 1.5 hours trekking and so far 3.5 km.
At sunrise, tourists can see clearly Ijen crater lake. Lake formed from a volcanic eruption about 2500 years ago, has turquoise water. So beautiful. Ijen crater lake is a lake that has a high acidity, and is the largest volcanic lake in the world. With a depth of up to 200 meters and an area of more than 5000 hectares.