The Sava Bohinjka originates in Ribčev Laz, at the confluence of the Jezernica, a short watercourse flowing out from Lake Bohinj and the Mostnica River. Some sources define the Jezernica as a part of the Sava Bohinjka, specifying the latter as flowing directly out of the lake, while another group of sources include Savica, rising at the southern flank of Triglav as the Savica Falls, downstream from Triglav Lakes Valley, and flowing into the lake, as a part of the Sava Bohinjka. The watercourse flows —including the length of the Savica—east to Radovljica, where it discharges into the Sava Dolinka. Downstream from the confluence, the river is referred to as the Sava.