The Chaco linguistic area is a linguistic area that includes various South American language families and isolates of the Chaco region of South America, in southern Brazil, southeastern Bolivia, Paraguay, Uruguay, and Argentina.
Charruan is sometimes also included. Jorge Suárez includes Charruan with Guaicuruan in a hypothetical Waikuru-Charrúa stock. Morris Swadesh includes Charruan along with Guaicuruan, Matacoan, and Mascoyan within his Macro-Mapuche stock. Both proposals appear to be obsolete.
Nikulin (2019) suggests a Macro-Chaco hypothesis linking Jê-Tupí-Cariban (including Karirian and Bororoan) with Mataco-Guaicuruan (possibly including Zamucoan):[4]
^ abcCampbell, Lyle; Grondona, Verónica (2012). "Languages of the Chaco and Southern Cone". In Grondona, Verónica; Campbell, Lyle (eds.). The Indigenous Languages of South America. The World of Linguistics. Vol. 2. Berlin: De Gruyter Mouton. pp. 625–668. ISBN9783110255133.