A coral reef is an underwater ecosystem characterized by reef-building corals. Reefs are formed of colonies of coral polyps held together by calcium carbonate...

The Great Barrier Reef is the world's largest coral reef system, composed of over 2,900 individual reefs and 900 islands stretching for over 2,300 kilometres...

Kingman Reef (/ˈkɪŋmən/) is a largely submerged, uninhabited, triangle-shaped reef, geologically an atoll, 9.0 nmi (20 km) east-west and 4.5 nmi (8 km)...

Synanceia verrucosa, the reef stonefish or simply stonefish, is a species of venomous, marine ray-finned fish, belonging to the subfamily Synanceiinae...

coastline, and has many coral reefs, cayes, and islands in the Caribbean Sea. Most of these form the Belize Barrier Reef, the longest in the western hemisphere...

bream, Stuart evader, dog bream, purple sea perch, red bream, red perch, red reef bream, river roman, or rock barramundi, is a species of marine ray-finned...

The Republic of Minerva was a micronation consisting of the Minerva Reefs. It was one of the few modern attempts at creating a sovereign micronation on...

of many identical individual polyps. Coral species include the important reef builders that inhabit tropical oceans and secrete calcium carbonate to form...

Pulley Ridge is a mesophotic coral reef system off the shores of the continental United States. The reef rests on sunken barrier islands and lies 100...

The Minerva Reefs (Tongan: Ongo Teleki) are a group of two submerged atolls located in the Pacific Ocean between Fiji, Niue and Tonga. The islands are...