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Kwalhioqua-Clatskanie (Kwalhioqua-Tlatskanai) is an extinct Athabascan language of Washington State, along the lower Columbia River.
- 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)