Explore: Reef

A reef is a ridge or shoal of rock, coral, or similar relatively stable material lying beneath the surface of a natural body of water. Many reefs result

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

Look up reefing in Wiktionary, the free dictionary. Reefing reduces the area of a sail, usually by folding or rolling one edge of the canvas in on itself

scarp in South Africa Great Barrier Reef or "The Reef", the planet's largest coral reef The Reef or The Reefs, a former mansion in Newport, Rhode Island, in

A reef aquarium or reef tank is a marine aquarium that prominently displays live corals and other marine invertebrates as well as fish that play a role

outer edge of the Great Barrier Reef and includes Heralds Beacon Island, Osprey Reef, the Willis Group and fifteen other reef/island groups. Cato Island is

Look up reef in Wiktionary, the free dictionary. A reef is a bar of rock, sand, coral or similar material, lying beneath the surface of water. Reef may also

The reef triggerfish (Rhinecanthus rectangulus), also known as the rectangular triggerfish, wedgetail triggerfish or by its Hawaiian name humuhumunukunukuāpuaʻa

island subsides, the coral fringing reef becomes a barrier reef that is detached from the island. Eventually, reef and the small coral islets on top of