A team of scientists from the Czech Republic has discovered the world’s largest underground thermal lake, located in southern Albania. They first stumbled upon the lake (and the elaborate cave system it’s a part of) in 2021, but didn’t have the proper equipment to properly study it, according to a press release.

Four years after it was first discovered, a team of Czech scientists have finally confirmed that they’ve found the world’s largest underground thermal lake. Nestled within the limestone of Vromoner in southern Albania,

Researchers have returned to an underground thermal lake they first came across in 2021 in southern Albania and confirmed it is the largest of its kind known in the world.