sea fort
From Warlike
Q20097897
Coastal defence and coastal fortification are measures taken to provide protection against military attack at or near a coastline, for example, fortifications and coastal artillery. Because an invading enemy normally requires a port or harbour to sustain operations, such defences are usually concentrated around such facilities, or places where such facilities could be constructed. Coastal artillery fortifications generally followed the development of land fortifications, usually incorporating land defences; sometimes separate land defence forts were built to protect coastal forts. Through the middle 19th century, coastal forts could be bastion forts, star forts, polygonal forts, or sea forts, the first three types often with detached gun batteries called "water batteries". Coastal defence weapons throughout history were heavy naval guns or weapons based on them, often supplemented by lighter weapons. In the late 19th century separate batteries of coastal artillery replaced forts in some countries; in some areas these became widely separated geographically through the mid-20th century as weapon ranges increased. The amount of landward defence provided began to vary by country from the late 19th century; by 1900 new US forts almost totally neglected these defences. Booms were also usually part of a protected harbor's defences. In the middle 19th century underwater minefields and later controlled mines were often used, or stored in peacetime to be available in wartime. With the rise of the submarine threat at the beginning of the 20th century, anti-submarine nets were used extensively, usually added to boom defences, with major warships often being equipped with them through early World War I. In World War I railway artillery emerged and soon became part of coastal artillery in some countries; with railway artillery in coast defence some type of revolving mount had to be provided to allow tracking of fast-moving targets.
Wikidata
File:Fort São Lourenço - Mozambique Island.jpg
Japanese, Maunsell fort,
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Location: KML, Cluster Map, Maps,
46 places
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File:Fort No1 tokyobay mlit1974.jpg Japanese sea fort ⓘ
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File:Redsandsforts.jpg Maunsell fort ⓘ
small, fortified towers built in the Thames and Mersey estuaries -
File:Daiba Park 台場公園 (第三台場) - panoramio.jpg No.3 Battery ⓘ
building in Tokyo, Japan -
File:第六台場 - panoramio.jpg No.6 Battery ⓘ
island in Japan -
File:Bull Sand Fort.jpg Bull Sand Fort ⓘ
sea fort in Humber estuary, Easington, East Riding of Yorkshire, England, UK -

El Cañuelo ⓘ
fortress in San Juan, Puerto Rico -
File:Flakfortet.jpg Flakfortet ⓘ
Danish sea fort -
File:Fort Carroll Key Bridge Aug2010.jpg Fort Carroll ⓘ
historic fort in Maryland, USA -
File:Ft-Heath-AP-c1921-SEly.jpg Fort Heath ⓘ
US seacoast military installation for defense -
File:Fort Louvois - Bourcefranc.jpg Fort Louvois ⓘ
island in France -
File:Fort Mahon.jpg Fort Mahon ⓘ
fort located on the coast of the Strait of Dover, northern France -

Fort of Saint Nicholas ⓘ
fortification in Rhodes, Greece -
File:Fort São Lourenço - Mozambique Island.jpg Fort São Lourenço ⓘ
for on the Island of Mozambique -

Fortifications des îles Saint-Marcouf ⓘ
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File:Haile-Sand-Fort.jpg Haile Sand Fort ⓘ
sea fort in Humber estuary, Tetney, East Lindsey, Lincolnshire, England, UK -
File:Haile-Sand-Fort.jpg Humber Forts ⓘ
two sea forts in the Humber Estuary in Northern England, UK -
File:Ile du large.jpg îles Saint-Marcouf ⓘ
group of two small islands off the coast of Normandy, France -
File:Kolaba Fort - Alibag.JPG Kolaba Fort ⓘ
building in India -

Mellemfort ⓘ
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Middelgrundsfortet ⓘ
island in Denmark -
File:Fort Janjira Unconquered.JPG Murud-Janjira ⓘ
Marine fort -
File:Murud 1.JPG Padmadurg ⓘ
building in India -
File:Droge gracht met beer - Muiden - 20341757 - RCE.jpg Pampus ⓘ
island in the Netherlands
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File:L'ile de Nekor (cropped).jpg Peñón de Alhucemas ⓘ
island in Spain -
File:Badis Island.jpg Peñón de Vélez de la Gomera ⓘ
Spanish peninsula claimed by Morocco
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File:Popes Eye Port Phillip Bay.jpg Pope's Eye ⓘ
uncompleted foundation for an island fort at Port Philip, Victoria, Australia -
File:Sindhudurg Fort, Back Wall.jpg Sindhudurg Fort ⓘ
Island fort in Arabian Sea off the coast of Western India -
File:South Channel Fort.jpg South Channel Fort ⓘ
island in Victoria, Australia -

Trekroner Fort ⓘ
ancient monument in Copenhagen Municipality (151218) -

Rocca a Mare ⓘ
fortress in Heraklion, Crete, Greece -
File:Vista aérea do Forte de São Marcelo.jpg São Marcelo Fort ⓘ
well listed by the Institute of Artistic and Cultural Heritage of Bahia in the city of Salvador, Bahia
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New Elfsborg Fortress ⓘ
fortress built to defend the city Gothenburg against the Danish fleet
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File:Dalarö Skans4.jpg Dalarö Fort ⓘ
it was intended to protect the inlet to the Stockholm archipelago.
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File:Porto Venere-isola Palmaria-torre Scola2.jpg Scola Tower ⓘ
sea fort in Italy -

Suomenlinna ⓘ
sea fortress by Helsinki, Finland -
File:Vijaydurg Fort 20.jpg Vijaydurg Fort ⓘ
fort located in Vijaydurg -
File:Fort Denison 10.JPG Fort Denison ⓘ
heritage-listed former penal site and defensive facility in Sydney Harbour, Australia

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File:Fort Boyard (51269094270).jpg Fort Boyard ⓘ
fort in Charente-Maritime, France -

Fort Sumter ⓘ
fort in Charleston, South Carolina

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File:RUS-2016-Aerial-SPB-Forts of Kronstadt (Fort Alexander I).jpg Fort Alexander I ⓘ
fort near Kronstadt -
File:Fort-Jefferson Dry-Tortugas.jpg Fort Jefferson ⓘ
fortified island in Florida, USA

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File:Brehon Tower.jpg Bréhon Tower ⓘ
sea fort in Guernsey -
File:No Mans Land Fort Geograph 1263735 87977ef9.jpg No Man's Land Fort ⓘ
Grade II listed sea fort in the Solent, UK -
St Helens Fort ⓘ
sea fort with lighthouse in the Solent close to the Isle of Wight, England, UK -
File:Guests Arriving at Spitbank Fort.jpg Spitbank Fort ⓘ
sea fort located in the Solent, near Portsmouth, England

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File:Horse Sand Fort - geograph.org.uk - 1087244.jpg Horse Sand Fort ⓘ
sea fort in the Solent off Portsmouth, Hampshire, England, UK -
File:Dragoer Fort Strube Indgang.jpg Dragør Fort ⓘ
ancient monument in Dragør Municipality (190217) -
Nab Tower ⓘ
lighthouse east of Isle of Wight, UK
| Type | Subtype | Date | Description | Notes | Source |
|---|---|---|---|---|---|
| class | group | 1890 | Japanese sea fort | sea fort, artificial island | Wikidata |
| class | group | 1942 | Maunsell fort | sea fort, fortified tower | Wikidata |
| site | artillery battery | 1854 | No.3 Battery | artificial island, sea fort, daiba | Wikidata |
| site | artillery battery | 1854 | No.6 Battery | sea fort, daiba, artificial island | Wikidata |
| site | fort | Bull Sand Fort | sea fort | Wikidata | |
| site | fort | El Cañuelo | sea fort | Wikidata | |
| site | fort | Flakfortet | sea fort, artificial island | Wikidata | |
| site | fort | Fort Carroll | sea fort | Wikidata | |
| site | fort | Fort Heath | sea fort | Wikidata | |
| site | fort | Fort Louvois | sea fort, fort, tidal island | Wikidata | |
| site | fort | Fort Mahon | sea fort, fort | Wikidata | |
| site | fort | Fort of Saint Nicholas | sea fort | Wikidata | |
| site | fort | Fort São Lourenço | sea fort, cultural heritage | Wikidata | |
| site | fort | Fortifications des îles Saint-Marcouf | sea fort | Wikidata | |
| site | fort | Haile Sand Fort | sea fort | Wikidata | |
| site | fort | Humber Forts | sea fort | Wikidata | |
| site | fort | îles Saint-Marcouf | sea fort, archipelago | Wikidata | |
| site | fort | Kolaba Fort | sea fort | Wikidata | |
| site | fort | Krepost Sveaborg naval front | sea fort | Wikidata | |
| site | fort | Mellemfort | sea fort | Wikidata | |
| site | fort | Middelgrundsfortet | sea fort, ancient monument, artificial island | Wikidata | |
| site | fort | Murud-Janjira | sea fort | Wikidata | |
| site | fort | Padmadurg | sea fort | Wikidata | |
| site | fort | Pampus | sea fort, fort, museum, island, artificial island | Wikidata | |
| site | fort | Peñón de Alhucemas | sea fort, island | Wikidata | |
| site | fort | Peñón de Vélez de la Gomera | sea fort, disputed territory, peninsula, island | Wikidata | |
| site | fort | Pope's Eye | sea fort, fixed construction | Wikidata | |
| site | fort | Prøvestenen | sea fort, destroyed building or structure, ancient monument | Wikidata | |
| site | fort | Sindhudurg Fort | sea fort | Wikidata | |
| site | fort | South Channel Fort | sea fort, island | Wikidata | |
| site | fort | Trekroner Fort | sea fort | Wikidata | |
| site | fort | 1523 | Rocca a Mare | sea fort | Wikidata |
| site | fort | 1623 | São Marcelo Fort | historic site, museum, cultural heritage, sea fort | Wikidata |
| site | fort | 1653 | New Elfsborg Fortress | heritage site in Sweden, sea fort, tourist attraction, fortress | Wikidata |
| site | fort | 1698 | Dalarö Fort | Bockholmen Hav & Restaurang, heritage site in Sweden, sea fort, tourist attraction | Wikidata |
| site | fort | 1700 | Scola Tower | sea fort, tower | Wikidata |
| site | fort | 1748 | Suomenlinna | Ehrensvärd Society, fortress island, sea fort, fortress | Wikidata |
| site | fort | 1756 | Vijaydurg Fort | sea fort | Wikidata |
| site | fort | 1788 | Fort Denison | sea fort, Government of New South Wales, military museum, Martello tower, island | Wikidata |
| site | fort | 1801 | Fort Boyard | sea fort | Wikidata |
| site | fort | 1811 | Fort Sumter | Passport to Your National Parks cancellation location, sea fort | Wikidata |
| site | fort | 1845 | Fort Alexander I | sea fort, architectural landmark | Wikidata |
| site | fort | 1847 | Fort Jefferson | sea fort, Union Army, island | Wikidata |
| site | fort | 1856 | Bréhon Tower | sea fort, lighthouse | Wikidata |
| site | fort | 1867 | No Man's Land Fort | sea fort | Wikidata |
| site | fort | 1867 | St Helens Fort | sea fort, lighthouse | Wikidata |
| site | fort | 1887 | Spitbank Fort | sea fort | Wikidata |
| site | fort | 1888 | Horse Sand Fort | sea fort | Wikidata |
| site | fort | 1915 | Dragør Fort | sea fort, artificial island | Wikidata |
| site | fort | 1918 | Nab Tower | sea fort, Trinity House, lighthouse | Wikidata |
| commons | image | Dalarö Tukholman saaristossa | Commons | ||
| commons | image | Bastion of Five Brothers 15 | Commons | ||
| commons | image | L00 355 Forte Sant’Andrea | Commons | ||
