The Sora is a right affluent of the Sava River in western Slovenia. The Sora gathers its waters mainly from the Škofja Loka Hills. Its source branches are the Poljane Sora, named after the Poljane Valley, and the Selca Sora, named after the Selca Valley. The Poljane Sora is larger and is 43 kilometres (27 mi) in length, while the Selca Sora is 32 km (20 mi) in length. They flow together in Škofja Loka and continue the flow as the Sora for the next 9.2 kilometres (5.7 mi) until Medvode, where the Sora joins the Sava. Including the Poljane Sora, the Sora is 52 km (32 mi) in length. This makes it the 15th longest river of Slovenia.