The
Chepelare River (, Čepelarska reka, also called
Čaja, Чая and
Asenica, Асеница) is a river in
Bulgaria that takes its source from Rozhen Peak (around 1,500 m above sea level) in the
Rhodopes. The river's length is about 87 km and two
hydroelectric plants are constructed on it, with a total maximum power of 2,400
kW.