Kvina is a river flowing from the municipality of Valle in Aust-Agder county, and mouthing into Fedafjorden in Kvinesdal, Vest-Agder county. The hydropower is utilized in several power stations, the largest is Tonstad Hydroelectric Power Station in Sirdal. The river passes through the regulated lakes Roskreppfjorden, Øyarvatn, Kvifjorden and Homstølvatnet.