According to the Sovereign Nation of Chitimacha,

The Chitimacha Tribe of Louisiana is the only tribe in Louisiana to still occupy a portion of their aboriginal homeland. The Chitimacha, according to oral history, “have always been here.” Unfortunately, over thousands of years the Chitimacha land base has significantly decreased. The Tribe’s lands once encompassed the entire Atchafalaya Basin, lands westward toward Lafayette, Louisiana, southward to the Gulf of Mexico and eastward to the New Orleans area. The Chitimacha Tribe currently maintains a reservation adjacent to the town of Charenton, in St. Mary Parish, Louisiana.

by Sovereign Nation of the Chitimacha

The Chitimacha Tribe’s language is unique and is an isolate, unrelated to any other language. The last know fluent speakers died in the early 1900s. However, the Chitimacha are reviving the language by teaching it at their tribal school, early learning center and through a grant from the Rosetta Stone company.