The Columbia Encyclopedia, Sixth Edition. 2001-07.
Madre de Dios
(mäd´rth dys) (KEY) , river, c.700 mi (1,130 km) long, rising in the Andes of SE Peru and flowing NE through NW Bolivia to the Beni River. It is a major artery of NW Bolivia, but frequent rapids make its lower course only partly navigable. It drains a rubber-producing region.