Ijen Crater Tours - West of Gunung Merapi is the Ijen volcano, which has a one-kilometer-wide turquoise-colored acid crater lake. The lake is the site of a labor-intensive sulfur mining operation, in which sulfur-laden baskets are carried by hand from the crater floor.
- Country : Bhutan
- Region : East Java, Indonesia
- City : Indonesia
- City area : Indonesia
- Address : Jl. Sebaung No. 157 Probolingggo, East Java, Indonesia