Gran Chaco
geographical name
Gran Cha·co
ˈgrän-ˈchä-(ˌ)kō 
variants
or Chaco
region of south central South America drained by the Paraguay River and its chief western tributaries the Pilcomayo and Bermejo; divided between Argentina, Bolivia, and Paraguay
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“Gran Chaco.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Gran%20Chaco. Accessed 26 Dec. 2024.
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