The Sinixt are a First Nations People. The Sinixt are descended from Indigenous peoples who have lived primarily in what are today known as the West Kootenay region of British Columbia in Canada and the adjacent regions of Eastern Washington in the United States for at least 10,000 years. The Sinixt are of Salishan linguistic extraction, and speak their own dialect (snsəlxcín) of the Colville-Okanagan language.

Castlegar is a community in the West Kootenay region of British Columbia, Canada. In the Selkirk Mountains, at the confluence of the Kootenay and Columbia Rivers, it is a regional trade and transportation centre, with a local economy based on forestry, mining and tourism.