National Marine Conservation Areas (NMCAs) is a Parks Canada programme responsible for marine areas managed for sustainability and containing smaller zones of high protection. They include the seabed, the water itself and any species which occur there. They may also include wetlands, estuaries, islands and other coastal lands. They are protected from dumping, undersea mining and oil and gas exploration and development, which may damage the aquatic or terrestrial ecosystems in the conservation area. However, not all commercial activities are prohibited in these zones. Shipping, commercial and sport fishing, and recreational activities are allowed.

Parks Canada, is the agency of the Government of Canada which manages the country's 48 National Parks, three National Marine Conservation Areas, 172 National Historic Sites, one National Urban Park, and one National Landmark. Parks Canada is mandated to "protect and present nationally significant examples of Canada's natural and cultural heritage, and foster public understanding, appreciation, and enjoyment in ways that ensure their ecological and commemorative integrity for present and future generations".