It receives the Lisina river from the right at the village of Donja Lisina and continues south to Bosilegrad, where it meets the Ljubatska reka. At Donja Lisina, the Božička reka is dammed, creating an artificial Lisina lake, used as an auxiliary reservoir for the Vrla hydro electrical power plants on the Vlasina River.
This river begins by receiving water from the Lisina river at the village of Donja Lisina and proceeds south to Bosilegrad, where it meets the Ljubatska reka. At Donja Lisina, a dam is constructed across the Božička reka, creating an artificial lake that provides additional water storage for the Vrla hydroelectric facilities on the Vlasina River.