The Kabul River (; ), the classical Cophen , is a river that emerges in Maidan Wardak Province in the Sanglakh Range of the Hindu Kush mountains in Afghanistan, and is separated from the watershed of the Helmand River by the Unai Pass. The Kabul River empties into the Indus River near Attock, Pakistan. It is the main river in eastern Afghanistan and the Khyber Pakhtunkhwa province of Pakistan.