brown rocky mountain beside sea under blue sky during daytime

Ijen lake in Indonesia, recognized as the largest highly acidic crater lake in the world

Prasanta Kr Dutta

Zongnan Bao

a large body of water surrounded by mountains

Ijen crater in Banyuwangi, East Java, Indonesia. Moody mountain views in the early morning.

green lake near brown mountain under blue sky during daytime

a group of people walking up a hill next to a lake

lake in the middle of mountains during daytime

Branch of hell on Earth.
Lake with acid, beaches with sulfur, and hydrogen sulfide smoke

a person standing on a rocky cliff overlooking a body of water

Exploring Kawah Ijen Crater, Java (Indonesia)