Lake Bafa or Lake Bafa Nature Park (Turkish: Bafa Gölü Tabiat Parkı) is a lake and a nature reserve situated in southwestern Turkey, part of it within the boundaries of Milas district of Muğla Province and the northern part within Aydın Province's Söke district. The lake used to be a gulf of the Aegean Sea until the Classical period, when the sea passage was gradually closed by the alluvial mass brought by Büyük Menderes River.