Side 1 is a map of Cozumel, "Island of Peace" in Mexico, one of the best dive and snorkeling locations in the world. Dive sites are named and located on the map. Side 2 is a coral reef creatures identification guide with beautiful illustrations of nearly 100 species. This convenient, waterproof reference is made of hard, laminated plastic with holes for lanyard and insertion in dive logs. 5.5" x 8.5"