Boundary Bay Wildlife Management Area protects the entire Canadian portion of Boundary Bay in British Columbia’s Lower Mainland, a shallow part of the Salish Sea on the border with Washington State. Created on 21 June 1995, it conserves critical habitat for migratory birds, resident fish, and marine mammals. Its most significant section, Mud Bay in the northeast, includes extensive mudflats and the estuaries of the Serpentine and Nicomekl rivers, which support high biodiversity and ecological productivity. Salt marshes and mudflats provide feeding and resting habitat for many birds, while the bay also supports harbour seals, visiting grey whales and orcas, and important spawning and feeding grounds for salmonids and Pacific herring.