The Kunhar River (Urdu: دریائے کنہار) also known as Nain Sukh Persian: "eye's repose" is 166 kilometres (103 mi) long river, located primarily in the Khyber Pakhtunkhwa province, northern Pakistan. It is in the Indus River watershed basin.
The river originates from Lulusar Lake, nearly 48 kilometres (30 mi) upstream from Naran Valley. Waters of Dudipat and Saiful Muluk Lakes feed the river besides glacial waters from Malka Parbat and other high peaks in the valley. The Kunhar river flows through the entire Kaghan valley, Jalkhad, the Naran valley, Kaghan, Balakot, and Garhi Habibullah.
The Kunhar River's confluence with the Jhelum River is outside Muzaffarabad, in the Azad Jammu and Kashmir province, Pakistan.