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...

species of reef-associated sharks which are known by the common name reef sharks. In the Indian and Pacific Oceans: Blacktip reef shark Grey reef shark Whitetip...

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...

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...

Reef is a brand of casual sandals, known as flip-flops (Australia: thongs, New Zealand: jandals), created by two Argentine brothers, Fernando and Santiago...

The Pacific reef heron (Egretta sacra), also known as the eastern reef heron or eastern reef egret, is a species of heron found throughout southern Asia...

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...

Blenheim Reef Blenheim Reef is a partly submerged atoll structure in the Chagos Archipelago, Indian Ocean. It includes the coral reef of Baxio Predassa...

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

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

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)...

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...

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...

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...

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 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...

Capitol Reef National Park is a national park of the United States in south-central Utah. The park is approximately 60 miles (100 km) long on its north–south...

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

Reef safe is a distinction used in the saltwater aquarium hobby to indicate that a fish or invertebrate is safe to add to a reef aquarium. There is no...

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

The grey reef shark or gray reef shark (Carcharhinus amblyrhynchos, sometimes misspelled amblyrhynchus or amblyrhinchos) is a species of requiem shark...

Batt Reef is a coral reef off Port Douglas in Shire of Douglas, Queensland, Australia. Batt Reef is centred at 16°24′S 145°46′E / 16.400°S 145.767°E...

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...

The Neptune Memorial Reef is an underwater columbarium in what was conceived by the creator as the world's largest man-made reef (covering over 600,000...

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...

Puff: Wonders of the Reef is a 2021 Australian nature documentary film made for Netflix and directed by Nick Robinson. Narrated by actress Rose Byrne,...

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...