Natú
Natú was an unclassified language once spoken in Brazil.
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Natú (a.k.a. Peagaxinan) is an extinct language of eastern Brazil. It was originally spoken on the Ipanema River in the Cariri area near present-day Porto Real do Colégio by the Natú people. It is so poorly attested that "only Greenberg dares to classify [it]". It has, however, been classified in a linguistic family with neighboring Xocó.
From Wikipedia · Natú language · CC BY-SA 4.0