Kwalhioqua–Clatskanie language

Kwalhioqua–Clatskanie (Kwalhioqua–Tlatskanai, Lower Columbia Athabaskan) is an extinct Athabaskan language of northwest Oregon and southwest Washington state, along the lower Columbia River. It was documented in the early 20th century, and a wordlist was compiled, consisting of some 322 words.

Dialects
Dialects were:


 * Kwalhioqua (a.k.a. Willapa or Willoopah) (north of the lower Columbia River)
 * Willapa or Wela'pakote'li subdialect
 * Suwal subdialect
 * Clatskanie (a.k.a. Tlatskanai) (south of the lower Columbia River)