River in the Western Cape, South Africa
Diep River (Afrikaans Dieprivier), drains the area between the Kasteel Mountain (north of Malmesbury) and the northern slopes of the Durbanville Hills, in the Western Cape, a province of South Africa.
33°22′00″S 18°51′00″E / 33.3667°S 18.8500°E / -33.3667; 18.8500