Bohinj (]; ), or the Bohinj Valley () or Bohinj Basin (), is a 20 km long and 5 km wide basin in the Julian Alps, in the Upper Carniola region of northwestern Slovenia. It is traversed by the Sava Bohinjka river. Its main feature is the periglacial Lake Bohinj (). Bohinj is part of the Municipality of Bohinj, the seat of which is Bohinjska Bistrica.