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Madeira[mudA´ru] Pronunciation Key, river, c.2,100 mi (3,380 km) long, formed by the junction of the Beni and MamorE rivers on the Bolivia-Brazil border. It flows north along the border for c.60 mi (100 km), then northeast in a winding course through the RondOnia and Amazonas sections of NW Brazil into the Amazon River. At its mouth is Ilha Tupinambaranas, an extensive marshy region formed by the Madeira's distributaries. The river receives numerous tributaries from the southeast and is navigable by ocean vessels to the falls and rapids near POrto Velho, Brazil. There the Madeira-MamorE RR begins a 227 mi (365 km) run around the unnavigable section to GuajarA-Mirim on the MamorE River.
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