The river is a tributary of the Struma river. It’s valley divides the mountains Ograzhden and Maleshevska and is a steep, deforested, eroded slopes. The length of the river Lebnitsa on Bulgarian territory is 50 km and its area is 318 km2. On the left valley slope is "Sokolata" - a small reserve which contains the only one in the mountain forest of Hungarian oak (Quercus frainetto). In Lebnitsa river is found fish such as barbel, Nase, chub. In the rocks above the river black storks and Golden Eagles (Aquila chrysaetos) are nesting.