Wailaki language
Wailaki, also known as Eel River, is an extinct and revitalizing Athabaskan language spoken by the people of the Round [Valley Reservation] of northern California, one of four languages belonging to the California Athabaskan cluster of the Pacific Coast Athabaskan languages. Dialect clusters reflect the four Wailaki-speaking peoples, the Sinkyone, Wailaki, Nongatl, and Lassik, of the Eel [River Athapaskans|Eel River] confederation. While less documented than Hupa, it is considered to be close to it. It went dormant in the 1960s, but in modern times it is being revived.