The Pech River system is fed from glaciers and snow from the Hindu Kush range to its north. The river rises in central Nuristan Province and flows south and southeasterly through the center of Kunar Province, joining the Kunar River (Asmar River, Loy Seend) at the provincial capital of Asadabad. The Kunar River is a tributary of the Kabul River, part of the Indus River basin.