Also found in: Medical, Encyclopedia, Wikipedia.
A river flowing about 1,610 km (1,000 mi) from west-central to northeast Peru, where it joins the Ucayali River to form the Amazon.
(Placename) a river in NE Peru, rising in the Andes and flowing northwest into the Ucayali River, forming the Amazon. Length: about 1450 km (900 miles)
a river in Peru, flowing N and then E, joining the Ucayali to form the Amazon. 1000 mi. (1600 km) long.