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Ucayali River

Ucayali River, chief headstream of the Amazon, in northern Peru. Formed by the junction of the Urubamba and Apurímac rivers in central Peru, it flows 1,000 mi (1,600 km) north to the Marañón River southwest of Iquitos.

See also: Amazon River.

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21st Century Webster's Family Encyclopedia21st Century Webster's Family Encyclopedia - Transcendentalism to United Church of Christ