Ijen is actually a complex of stratovolcanoes near Banyuwangi in East of Java. Kawah Ijen (Ijen Crater) is the center of attraction, which contains a nearly 1 km wide, turquoise-colored, acid crater lake.

Kawah Ijen is also the site of a labor-intensive sulfur mining operation in which sulfur-laden baskets are hand-carried from the crater floor. The weight of the sulfur stones carried by the labor shoulder can reached up to 80 kg. Coffee, cocoa, clove and rubber plantation surrounding the area of the Ijen Crater, which was established by Dutch colonial government is still run very well and can be visited. A trip to Ijen Crater starts from Bondowoso or Banyuwangi where many tourist information and facilities are available.