Offshore Lighthouses are lighthouse

Lighthouse

A lighthouse is a tower, building, or other type of structure designed to emit light from a system of lamps and lenses or, in older times, from a fire, and used as an aid to navigation for maritime pilots at sea or on inland waterways....

s that are not close to land. There can be a number of reasons for these lighthouses to be built. There can be a shoal

Shoal

Shoal, shoals or shoaling may mean:* Shoal, a sandbank or reef creating shallow water, especially where it forms a hazard to shipping* Shoal draught , of a boat with shallow draught which can pass over some shoals: see Draft...

, reef

Reef

In nautical terminology, a reef is a rock, sandbar, or other feature lying beneath the surface of the water ....

 or submerged island

Island

An island or isle is any piece of sub-continental land that is surrounded by water. Very small islands such as emergent land features on atolls can be called islets, cays or keys. An island in a river or lake may be called an eyot , or holm...

 several miles from land.

United States

The Stratford Shoals, Middle Ground lighthouse in Long Island Sound

Long Island Sound

Long Island Sound is an estuary of the Atlantic Ocean, located in the United States between Connecticut to the north and Long Island, New York to the south. The mouth of the Connecticut River at Old Saybrook, Connecticut, empties into the sound. On its western end the sound is bounded by the Bronx...

 is about 6 miles from land. There are many examples of such lighthouses throughout the world. Many are considered to be stag light

Stag light

"Stag light" was the unofficial term given to isolated lighthouses in the United States Lighthouse Service.-See also:*...

houses.

There are two lighthouse

Lighthouse

A lighthouse is a tower, building, or other type of structure designed to emit light from a system of lamps and lenses or, in older times, from a fire, and used as an aid to navigation for maritime pilots at sea or on inland waterways....

s in the German Bight

German Bight

German Bight is the southeastern bight of the North Sea bounded by the Netherlands and Germany to the south, and Denmark and Germany to the east . To the north and west it is limited by the Dogger Bank. The Bight contains the Frisian and Danish Islands. The Wadden Sea is approximately ten to...

 on the northern coast of Germany which have been built offshore on sand:

1. Roter Sand (Leuchtturm)
2. Alte Weser (Leuchtturm)
   Alte Weser (lighthouse)
   The Alte Weser Lighthouse is located offshore from the estuary mouth of the river Weser in the German Bight, southern North Sea.It was built on sand between 1961 and 1964. The Alte Weser lighthouse took over duties and replaced the historical Roter Sand lighthouse on September 1, 1964...
   
   

Most caisson lighthouse

Caisson lighthouse

A caisson lighthouse is a lighthouse whose superstructure rests on a concrete or metal caisson.Caisson lighthouses were developed in the late nineteenth century as a cheaper, more efficient alternative to screwpile lighthouses; they could better withstand harsh weather, and were not as fragile...

s are offshore lighthouses.