gran chaco

noun

1. an extensive subtropical region in central South America, in Argentina, Bolivia, and Paraguay. 300,000 sq. mi. (777,000 sq. km).

noun

1. a plain of S central South America, between the Andes and the Paraguay River in SE Bolivia, E Paraguay, and N Argentina: huge swamps and scrub forest Area: about 780 000 sq km (300 000 sq miles)Often shortened to: Chaco