Pilcomayo River

Pilcomayo River

geographical name

River, south-central South America. The chief western tributary of the Paraguay River, it rises in the eastern Andes Mountains in west-central Bolivia. It flows southeast through the Gran Chaco of Paraguay to join the Paraguay River opposite AsunciĆ³n, after about 1,000 mi (1,600 km). It forms part of the border between Argentina and Paraguay.

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