The Lower Mainland is a geographic and cultural region of the mainland coast of British Columbia that generally comprises the regional districts of Metro Vancouver and Fraser Valley. Home to approximately 3.05 million people as of the 2021 Canadian census, the Lower Mainland contains sixteen of the province's 30 most populous municipalities and approximately 60% of the province's total population.
The region is the traditional territory of the Sto:lo, a Halkomelem-speaking people of the Coast Salish linguistic and cultural grouping.
Although the term Lower Mainland has been recorded from the earliest period of colonization in British Columbia, it has never been officially defined in legal terms. The term has historically been in popular usage for over a century to describe a region that extends from Horseshoe Bay south to the Canada–United States border and east to Hope at the eastern end of the Fraser Valley. This definition makes the term Lower Mainland al