Tennessee Reef is a coral reef located within the Florida Keys National Marine Sanctuary. It lies to the southeast of Long Key. It consists of drowned (deep) spur-and-groove reef. Much of the reef is within a designated "Research Only" zone. An unmanned reef light is located near the reef. External links Benthic Habitat Map References NOAA National Marine Sanctuary Maps, Florida Keys East NOAA Website on Tennessee Reef NOAA Navigational Chart 11449 Coral reefs of the Florida Keys