Dease Lake is a small community located in the Cassiar Country of the Northern Interior of British Columbia, Canada. Located only a few hours south of the Yukon border, it is located on Highway 37 at the south end of the lake of the same name. Dease Lake is the last major centre before the Alaska Highway, and also the junction to Telegraph Creek and the magnificent Grand Canyon of the Stikine.

The town sits astride a pass separating the basins of the Dease River (N) from that of the Tanzilla (S), a tributary of the Stikine. The pass is part of Continental Divide and is a division point between drainage to the Pacific Ocean, via the Stikine, and the Arctic Ocean, via the Liard and Mackenzie Rivers.

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