The Kabul River (Persian/Urdu: دریای کابل‎; Pashto: کابل سیند‎, Sanskrit: कुभा ), the classical Cophes /ˈkoʊfiːz/, is a 700-kilometre (430 mi) long river that emerges in the Sanglakh Range of the Hindu Kush mountains in Afghanistan and empties into the Indus River near Attock, Pakistan. It is the main river in eastern Afghanistan and is separated from the watershed of the Helmand by the Unai Pass. The Kabul River passes through the cities of Kabul and Jalalabad in Afghanistan before flowing into Khyber Pakhtunkhwa in Pakistan some 25 kilometres (16 mi) north of the Durand Line border crossing at Torkham.