Pronunciation: (OO"rOO-väm'bä; Eng. oor"u-bäm'bu), [key]
a river rising in SE Peru, flowing NW through the Andes Mountains to central Peru to meet the Apurímac River and form the Ucayali River. 450 mi. (725 km) long.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.