Atha·basca (at̸h′ə bas′kə)

1. river rising in the Rocky Mountains of SW Alberta, Canada, and flowing northeast into Lake Athabasca: 765 mi (1,231 km)
2. lake extending across the N Alberta-Saskatchewan, Canada, border: 3,100 sq mi (8,029 sq km)

Etymology: Cree dial. ahthapaskaaw, name of lake, lit., there are reeds here and there < ahthap-, net(like) + -ask-, vegetation + formative suffixes