The Willapa or Willoopah, also known as Kwalhioqua / Kwalhiokwa, were a Northern Athapaskan-speaking people in southwestern Washington, United States.
[1] Together with the Clatskanie people (also: Tlatskanai / Klatskanai, according to tradition originally part of the "Suwal/Swaal" subgroup) in the upper Nehalem River Valley and along the headwaters of the Klaskanine and Clatskanie River in northwestern Oregon they spoke dialects of the now extinct Kwalhioqua-Clatskanie (Kwalhioqua–Tlatskanai) language, the Willapa dialect was the most divergent.
The Kwalhioqua lived north of the lower Columbia River, the Clatskanie (Tlatskanai) to the south, separated by the territory of the Lower Chinook-speaking Shoalwater Bay Chinook (or Willapa Chinook) or Clatsop and the Kathlamet (Cathlamet), who spoke another Chinookan variant.
The small parcel is part of a larger residential and agriculture village that existed between the years 1000 and 1499.
The exact location is restricted to the public and considered "virtually undisturbed".