River, central Peru.
Part of the Amazon River drainage system, it rises in the Andes Mountains and flows northwest for about 450 mi (725 km) to its junction with the Apurímac River , the two then forming the Ucayali River . In the Gorge of Torontoy, the river plunges from about 11,000 ft (3,400 m) above sea level to about 8,000 ft (2,400 m) in 20 mi (32 km).