Dictionary![]() ![]() Gran Cha•coPronunciation: (grän chä'kô), [key] an extensive subtropical region in central South America, in Argentina, Bolivia, and Paraguay. 300,000 sq. mi. (777,000 sq. km). Also called Chaco. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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