National Marine Sanctuary System

Map displaying the network 15 national marine sanctuaries and the Papahānaumokuākea Marine National Monument

The Office of National Marine Sanctuaries serves as the trustee for a network of underwater parks encompassing more than 620,000 square miles of marine and Great Lakes waters from Washington state to the Florida Keys, and from Lake Huron to American Samoa. The network includes a system of 15 national marine sanctuaries and Papahānaumokuākea and Rose Atoll marine national monuments.

Eastern Region

Florida Keys Flower Garden Banks Gray's Reef Hudson Canyon (in designation) Lake Erie (in designation) Lake Ontario Mallows Bay-Potomac River Monitor Stellwagen Bank Thunder Bay Wisconsin-Shipwreck Coast

West Coast Region

Channel Islands Chumash Heritage (in designation) Cordell Bank Greater Farallones Monterey Bay Olympic Coast

Pacific Islands Region

American Samoa Hawaii Humpback Whale Pacific Remote Islands (in designation) Papahānaumokuākea