Seahorse Reef is a purpose-built nearshore artificial snorkel reef off Topsail Hill State Park, sculpted into a seahorse shape and built from multiple reef modules to create shallow habitat. It is best approached as a calm-weather snorkel or freedive site, with the beach, kayak, or paddleboard approach becoming the main planning factor when wind or chop picks up. The reef is shallow enough for casual exploration and is designed to support fish and other marine life rather than deep diving.