The Hispar River forms from the melt water of the Hispar Glacier - a 49 kilometer-long glacier in the Northern Areas of Pakistan's Karakoram Mountains. The Hispar Glacier and river both flow northwest, passing through Hispar, Hopar and Nagar (Nagir) villages until the confluence with the Hunza River in the Hunza Valley. Road conditions are spectacular at best, treacherous at worst.