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...

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...

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...

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...

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

Nelscott Reef is an ocean reef near Lincoln City, Oregon, United States, that creates a reef break (a surf-break created by the presence of a rock or...

Caledonian barrier reef is a barrier reef located in New Caledonia in the South Pacific, being the longest continuous barrier reef in the world and the...

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...

A reef knoll is a landform that comprises an immense pile of calcareous material that had previously accumulated on an ancient sea floor. Reef knolls are...

An artificial reef (AR) is a human-created freshwater or marine benthic structure. Typically built in areas with a generally featureless bottom to promote...

Reef are an English rock band from Glastonbury whose members include Gary Stringer on vocals, Amy Newton on guitar, Jack Bessant on bass, and Luke Bullen...

The Rainbow Reef is a reef in the Somosomo Strait between the Fijian islands of Taveuni and Vanua Levu. It is one of the most famous dive sites in the...

First Reef or more colloquially just "the Reef". Until the 1970s, there was little or no resident surfing population in Point Leo, so the Reef was mainly...

The whitetip reef shark (Triaenodon obesus) is a species of requiem shark, in the family Carcharhinidae, and the only member of its genus. A small shark...

The reef knot, or square knot, is an ancient and simple binding knot used to secure a rope or line around an object. It is sometimes also referred to as...

The blacktip reef shark (Carcharhinus melanopterus) is a species of requiem shark, in the family Carcharhinidae, which can be easily identified by the...

The western reef heron (Egretta gularis), also called the western reef egret, is a medium-sized heron found in southern Europe, Africa and parts of Asia...

Lasseter's Reef refers to the purported discovery, announced by Harold Bell Lasseter in 1929 and 1930, of a fabulously rich gold deposit in a remote and...

Reef, which includes West, Middle and East Islands, in addition to two lagoons, as well as Cartier Reef, which includes Cartier Island. Ashmore Reef covers...

Mischief Reef, also known as Meiji Reef (Chinese: 美濟礁/美济礁; pinyin: Měijì Jiāo), Vành Khăn Reef (Vietnamese: Đá Vành Khăn), or Panganiban Reef (Filipino:...

A fringing reef is one of the three main types of coral reef. It is distinguished from the other main types, barrier reefs and atolls, in that it has...

Donovan's Reef is a 1963 American adventure comedy film starring John Wayne and Lee Marvin. It was directed by John Ford and filmed in Kauai, Hawaii, but...

25°24′54″N 170°35′24″W / 25.415°N 170.590°W / 25.415; -170.590 Maro Reef (Hawaiian: Nalukākala - "surf that arrives in combers") is a largely submerged...

Dolphins Reef advertises the following activities that they claim focus mainly on dolphins and conserving them -Swimming with dolphins, diving lessons...

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)...

235 Penfield Reef is a partially submerged reef that extends a mile into Long Island Sound from the coast of Fairfield, Connecticut. The reef is one of the...