The Tsetsaut (Nisga'a language: Jits'aawit; in the Tsetsaut language: Wetaŀ or Wetaɬ) were an Athabaskan-speaking group whose territory was around the head of the Portland Canal, straddling what is now the boundary between the US state of Alaska and the Canadian province of British Columbia.
The name T'set'sa'ut, meaning "those of the Interior", was used by the Nisga'a and Gitxsan in reference to their origin as migrants into the region from somewhere farther inland; their use of the term is not to the Tsetsaut alone but also can refer to the Tahltan and the Sekani.
[1] In 1830 their numbers were estimated to be up to 500, at which point they were living in the Behm Canal, where they had been friendly with the Sanya kwaan of the Tlingit and Lakweip at which point they moved to the Portland Canal.
According to Teit, Tsetsaut territory "...lay in a strip from near Bradfield Canal and the Iskut across the streams flowing into Behm Canal perhaps to about the head of Boca de Quadra.
They occupied all of the upper part of Portland Canal around the BC town of Stewart, and Salmon and Bear Rivers.