The river has an area of about 27,300 square kilometres. in the provinces of Apayao, Aurora, Cagayan, Ifugao, Isabela, Kalinga, Mountain Province, Nueva Vizcaya.
Ti karayan ket addaan ti pagattianan a lugar iti agarup a 27,300 km². kadagiti probinsia ti Apayao, Aurora, Cagayan, Ifugao, Isabela, Kalinga, Mountain Province, Nueva Vizcaya, ken Quirino.