Beni

()

river in NW Bolivia, rising in the Andes, flowing northward to join the Mamoré and form the Madeira: c. 1,000 mi (1,609 km)

See Beni in American Heritage Dictionary 4

A river of central and northwest Bolivia rising in the Andes and flowing about 1,599 km (994 mi) to the Mamoré River.
link/cite print suggestion box