Mattole language
Mattole, or Mattole–Bear River, is an extinct Athabaskan language once spoken by the Mattole and Bear [River Indians (California)|Bear River] peoples of northern California. It is one of the four languages belonging to the California Athabaskan cluster of the Pacific Coast Athabaskan languages. It was found in two locations: in the valley of the Mattole River, immediately south of Cape Mendocino on the coast of northwest California, and a distinct dialect on Bear River, about 10 miles to the north. The Mattole have expressed interest in reviving their language.