The Stewart–Cassiar Highway, also known as the Dease Lake Highway and the Stikine Highway as well as the Thornhill –Kitimat Highway from Kitimat to Thornhill, is the northwesternmost highway in the Canadian province of British Columbia. A scenic route through some of the province's most isolated areas, the highway first gained designation as British Columbia Highway 37 in the year 1975. At that time, its southern terminus was at the community of New Hazelton on the BC Highway 16. In 1975, with the completion of a new bridge over the Kitimat River, the highway's Yellowhead junction was relocated to a point on Highway 16 just south of the site of Kitwanga. Highway 37 was then extended south to Kitimat in 1986 superseding what was then designated Highway 25. At the north end, the highway briefly stretches into the Yukon, becoming Yukon Highway 37.

Kitimat is a district municipality in the North Coast region of British Columbia, Canada. It is a member municipality of the Regional District of Kitimat–Stikine regional government. The Kitimat Valley is part of the most populous urban district in northwest British Columbia, which includes Terrace to the north along the Skeena River Valley. The city was planned and built by the Aluminum Company of Canada (Alcan) during the 1950s. Its post office was approved on 6 June 1952.