Pacific Coast Athabaskan languages

Pacific Coast Athabaskan is a geographical and possibly genealogical grouping of the Athabaskan language family. 
California Athabaskan.
Often the Mattole and Wailaki-speaking groups together are called Southern Athapaskans. Their languages were similar to each other, but differed from the northern California tribes whose languages were also part of the Athapaskan family. They are not to be confused with the Apachean peoples (the Apache and Navajo) - also known as Southern Athabascans - of the Southwestern United States and Northern Mexico, who speak the Southern Athabaskan languages.