North Reef Light is an active lighthouse located on North Reef, a 5.6 square kilometres (2.2 sq mi) planar reef, about 120 kilometres (75 mi) northeast...

North Reef may refer to: North Reef, Solomon Islands North Reef, Queensland North Reef Light North Reef, Paracel Islands North Reef, Spratly Islands (in...

The Robbins Reef Light Station is a sparkplug lighthouse located off Constable Hook in Bayonne, Hudson County, New Jersey, United States, along the west...

The St. George Reef Light is an inactive lighthouse built on North West Seal Rock, six miles (10 km) off the coast of northern California near Crescent...

Alligator Reef Light is located 4 nautical miles (7.4 km; 4.6 mi) east of Indian Key, near the Matecumbe Keys of Florida in the United States, north of Alligator...

Penfield Reef Lighthouse is a lighthouse in Connecticut, United States, on Penfield Reef at the south side of Black Rock Harbor entrance on the Long Island...

The Essex Reef Light or Essex Reef Post Light, also known as Hayden's Point Light, was a light in Essex, Connecticut on the Connecticut River. The 21-foot...

The Poe Reef Light was an extension of the effort—beginning in 1870 through 1910—where engineers began to build lights on isolated islands, reefs, and shoals...

North Danger Reef (Vietnamese: Cụm Song Tử) is one of the seven major reefs / banks / etc. in the Spratly Islands area of the South China Sea. It is the...

Spectacle Reef Light is a lighthouse 11 miles (18 km) east of the Straits of Mackinac and is located at the northern end of Lake Huron, Michigan. It was...

Wharton Reef Light is an inactive lighthouse which used to be located on Wharton Reef in Princess Charlotte Bay off the Cape York Peninsula, Queensland...

The DeTour Reef Light is a non-profit-operated lighthouse marking the southern entrance of the DeTour Passage between the eastern end of Michigan's Upper...

Carysfort Reef Light is located on Carysfort Reef east of Key Largo, Florida. The lighthouse has an iron-pile foundation with a platform, and a skeletal...

older reef lights, but had no keeper's quarters. The first two unmanned lights in the Florida Keys, the Molasses Reef Light and the Pacific Reef Light, were...

The Colchester Reef Light in Vermont was a lighthouse off Colchester Point (northwest of Burlington, Vermont) in Lake Champlain. It was moved to the Shelburne...

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...

Southwest Reef Light is a historic lighthouse built in 1856 at the end of Southwest Reef in Atchafalaya Bay, Louisiana to replace lightships which had...

The Grays Reef Light is a lighthouse located in northeastern Lake Michigan, 3.8 miles (6.1 km) west of Waugoshance Island in Bliss Township, Michigan....

The Brenton Reef Light was a Texas tower lighthouse at the entrance to Narragansett Bay, Rhode Island, United States, south of Beavertail Point. Erected...

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...

Creal Reef Light is an active lighthouse located at Creal Reef, a planar reef about 150 kilometres (93 mi) east of Mackay, Queensland, Australia. It guides...

The Racine Reef Light was a lighthouse located in Lake Michigan some two miles east of Racine, Wisconsin, marking the edge of its eponymous shallows. It...

Florida Reef (also known as the Great Florida Reef, Florida reefs, Florida Reef Tract and Florida Keys Reef Tract) is the only living coral barrier reef in...

Light is a lighthouse located on a reef that was the most serious hazard to navigation on Lake Superior. The exposed crib of the Stannard Rock Light is...

Wyborn Reef Light is an active lighthouse located at Wyborn Reef, formerly known as Y Reef, about 16 kilometres (9.9 mi) southeast of Albany Island, east...

Island on the western side of the Mindoro Strait. The Apo Reef Light, situated on the north-east part of the island, warns ship about the location of...

Islands. The reef is oval in shape, approximately 1.5 km (1 mile) east to west and 0.5 km (500 yards) north to south. While most of Louisa Reef is submerged...

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...

inland waterways. Lighthouses mark dangerous coastlines, hazardous shoals, reefs, rocks, and safe entries to harbors; they also assist in aerial navigation...

include blunthead shark, light-tip shark, reef whitetip shark, and whitetip shark. Once placed in the family Triakidae, the whitetip reef shark is now recognized...