The Regional District of East Kootenay (RDEK) is a regional district in the Canadian province of British Columbia, Canada. At the 2011 census, the population was 56,685. Its area is 27,542.69 square kilometres (10,641.16 sq mi). The regional district offices are in Cranbrook, the largest community in the region. Other important population centers include the cities of Kimberley and Fernie, and the district municipality of Invermere and Sparwood.