In the past, the river was known as Svetivrachka Bistritsa and is a left tributary of the Struma River. It is formed by the rivers Sarchaliitsa, Bashliitsa, Chairska, Mozgovitsa and Begovitsa (Kriva reka). Bistritsa passes through Lilyanovo, Sandanski, and flows in Struma river. The length of the river is 33 km and is one of the biggest tributaries of Struma. An interesting sight is Popina Laka waterfalls, located in the upper stream.