Madeira River, a main tributary of the Amazon River. It begins at the junction of the Mamore and Beni rivers and flows generally northeastward through Brazil, reaching the Amazon 90 miles (145 km) east of Manaus.
WHAT'S INSIDE: SOUTH AMERICA
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Bolivia, officially, Republic of Bolivia, a landlocked country in South America. Bolivia is bordered by Chile and Peru, which separate it from the Pacific Ocean, and by Brazil, Paraguay, and Argentina.
Chile, or Republic of Chile, a country in South America. It occupies a long, narrow strip along the Pacific coast, stretching from north of the Tropic of Capricorn to Cape Horn at the southern tip of the continent.