Lake Bohinj (Slovene: Bohinjsko jezero), covering 318 hectares ), is the largest permanent lake in Slovenia. It is located within the Bohinj Valley of the Julian Alps, in the northwestern Upper Carniola region, and part of Triglav National Park.
The clear waters are the habitat of brown trout, burbot, European chub, common minnow and Arctic char, eight genera of molluscs, as well as of numerous algae species. It is a popular day trippers' destination for swimming and other water sports.