River, southern Peru. Arising in the
Andes Mountains in Peru, it is the most distant source of the
Amazon River. It flows northwest to join the
Urubamba River and form the
Ucayali River. For most of its 430-mi (700-km) length, it flows through narrow canyons, and its course is interrupted by falls and rapids. Short stretches of its lower course are also called the Ene River and the Tambo River.
For more information on Apurmac River, visit Britannica.com.