2025-05-14 00:00:00 National marine sanctuaries are underwater treasures found across U.S. ocean waters and Great Lakes. Sanctuaries, like our national parks, protect amazing places, are home to awe-inspiring species and tell the stories of our past. Marine Sanctuary Explorer is your official guide to the protected waters of the Florida Keys, home to the only continental barrier reef in the U.S. The app has been designed to help you make the most of your visit while recreating responsibly, created by people who know the sanctuary: The Office of National Marine Sanctuaries and National Marine Sanctuary Foundation. At every stage of your visit (before, during, and after), you can use this app and its features to learn more about Florida Keys National Marine Sanctuary. Before you arrive, download the app to discover points of interest throughout the sanctuary, including coral reefs, shipwrecks, lighthouses, and more. Bookmark new spots to explore, create a travel plan, or find a local guide for specialized experiences like sunset cruises, diving, and fishing trips.