Coahuilteco

Coahuilteco, also called Pakawa, was an indigenous language of southern Texas and northeastern Mexico, spoken by nomadic Coahuilteco bands across Coahuila, Nuevo Leon and Tamaulipas. It is usually treated as a language isolate, since the wider Coahuiltecan family once proposed for many of the region's poorly recorded tongues has never been proven.

After Spanish missionaries founded the mission of San Antonio de Valero at San Antonio in 1718, Coahuilteco served as a lingua franca among the diverse native groups settled there, and the priests learned and recorded it. Most neighboring languages vanished with their peoples between the sixteenth and nineteenth centuries and were never written down.