A National Marine Sanctuary is a protected area in the ocean or Great Lakes designated to conserve marine ecosystems, cultural resources, and biodiversity. These sanctuaries aim to balance environmental protection with sustainable use, allowing activities like fishing, boating, and diving while safeguarding habitats and species. Established by the National Oceanic and Atmospheric Administration (NOAA), National Marine Sanctuaries promote research, education, and public awareness about marine conservation. They help protect important areas such as coral reefs, shipwrecks, and unique underwater landscapes, ensuring that these natural treasures are preserved for future generations.