EEL RIVER ATHABASKAN Click for CAHTO, HUPA, or MATTOLE   Eel River Athabaskan Territory: North coastal California. Eel River Athabaskan Divisions: Wailaki, Lassik, Nongatl, and Sinkyone.   Portals .   Round Valley Indian Tribes : part of whose membership is Eel River Athabaskan Covelo, California Eel River Athabaskan Population United States (2010) - 150 N A - D E N E