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Pilcomayo (pēlkōmäˈyō) [key], river c.1,000 mi (1,600 km) long, rising in the Bolivian Andes E of Lake Poopó and flowing SE in a marshy course across the Gran Chaco to the Paraguay River near Asunción. It forms part of the Argentina-Paraguay border.

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.

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