Dease Lake is a lake in the Stikine Plateau of the Northern Interior of British Columbia, Canada, located at the head of the Dease River, which flows north then northeast from the lake to join the Liard River. The community of Dease Lake, British Columbia, formerly Dease Lake Post, is located at the south end of the lake, straddling a low pass which leads into the basin from the Tanzilla River, a tributary of the Stikine. The area around the lake was the focus of the Cassiar Gold Rush and numerous ghost towns and former settlement sites are scattered around its shores, including Laketon and Centre City. Dease Lake is the burial site and has a monument to English travelogue writer Warburton Pike.