Go Beneath the Surface

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 16 national marine sanctuaries and Papahānaumokuākea and Rose Atoll marine national monuments.

national marine Sanctuary system map

Eastern Region

West Coast Region

Pacific Islands Region

Olympic Coast
National Marine Sanctuary

Washington Coast, USA

Sanctuary News

person on a boat holding up two lionfish

Rachel Bowman Leads Lionfish Invitationals at Flower Garden Banks National Marine Sanctuary

As invasive lionfish spread up and down the East Coast of the United States and throughout the Caribbean, staff at Flower Garden Banks National Marine Sanctuary started planning for ways to address the inevitable problem of this invasive species reaching the Gulf of Mexico.

person underwater

Sanctuary Snapshots: Expert Photography Tips from Ocean Photo Contest Champions

Ocean Guardian School students examine clipboard on the beach.

Back to School and Into Your Sanctuaries

a school of crevalle jacks swim through clear water over a coral reef

Learn About Water Quality With Karen Bohnsack, Marine Resources Manager at Florida Keys National Marine Sanctuary

scenic view of moss-covered sea cliffs overlooking a rustic beach

Sanctuary Spotlight: Olympic Coast

a man paddleboarding with the sun peaking out the water behind him

Seven Tips to Recreate Responsibly in Your National Marine Sanctuaries

a shoreline with a steep cliff and many bowling-ball like rocks on the beach

Marine Heatwaves, Kelp Loss, and Water Quality Hazards Highlighted in Greater Farallones Condition Report

marine debris on a beach

Students Ignite Environmental Change Across Campuses: Students for Zero Waste Week

researchers on deck preparing to deploy a new data buoy

Notes from the Field

Join us behind the scenes for a look at research taking place above and below the water.

National Marine Sanctuary System Posters

ROV shinning it

Coastal mangroves and seagrass are nurseries for many species of fish, invertebrates and birds that inhabit Florida Keys National Marine Sanctuary. These calm, shallow waters are <a href=ideal for paddle sports, snorkeling, and fishing for species like tarpon. The offshore coral reef features elkhorn and brain corals, sponges, and other invertebrates which create habitat for spiny lobster, urchins, and many other species of reef fish like sergeant major and larger fish like sharks, rays, barracuda, and snapper." />

During the National Marine Sanctuary System's 50th anniversary celebration in 2022, a commemorative poster series was launched to capture the beauty and diversity of each site in the system. The posters are two sided, featuring original artwork on the front and educational information on the back. Other posters created for the system over the years have also been added. Dive in and download your sanctuary posters today!

Virtual Dives

Immerse yourself in the ocean and your national marine sanctuaries without getting wet!

Our planet is an ocean planet: Earth Is Blue . The National Marine Sanctuary System protects some of the most iconic underwater places throughout the United States, but we can't do it without you. No matter where you are, the ocean and Great Lakes are in your hands. We hope these images inspire you to help care for our ocean and to spread the word that Earth isn't green – it's blue .