The Gulf of Finland is the easternmost arm of the Baltic Sea. It extends between Finland to the north and Estonia to the south, to Saint Petersburg in Russia to the east, where the river Neva drains into it. Other major cities around the gulf include Helsinki and Tallinn. The eastern parts of the Gulf of Finland belong to Russia, and some of Russia's most important oil harbors are located farthest in, near Saint Petersburg. As the seaway to Saint Petersburg, the Gulf of Finland has been and continues to be of considerable strategic importance to Russia. Some of the environmental problems affecting the Baltic Sea are at their most pronounced in the shallow gulf. Proposals for a tunnel through the gulf have been made.
A siege is a military blockade of a city, or fortress, with the intent of conquering by attrition, or by well-prepared assault. This derives from Latin: sedere, lit. 'to sit'. Siege warfare is a form of constant, low-intensity conflict characterized by one party holding a strong, static, defensive position. Consequently, an opportunity for negotiation between combatants is common, as proximity and fluctuating advantage can encourage diplomacy.
A glacis in military engineering is an artificial slope as part of a medieval castle or in early modern fortresses. They may be constructed of earth as a temporary structure or of stone in more permanent structure. More generally, a glacis is any slope, natural or artificial, which fulfils the above requirements. The etymology of this French word suggests a slope made dangerous with ice, hence the relationship with glacier.
A castle is a type of fortified structure built during the Middle Ages predominantly by the nobility or royalty and by military orders. Scholars usually consider a castle to be the private fortified residence of a lord or noble. This is distinct from a mansion, palace and villa, whose main purpose was exclusively for pleasance and are not primarily fortresses but may be fortified. Use of the term has varied over time and, sometimes, has also been applied to structures such as hill forts and 19th- and 20th-century homes built to resemble castles. Over the Middle Ages, when genuine castles were built, they took on a great many forms with many different features, although some, such as curtain walls, arrowslits, and portcullises, were commonplace.
A moat is a deep, broad ditch, either dry or filled with water, that is dug and surrounds a castle, fortification, building, or town, historically to provide it with a preliminary line of defence. In some places moats evolved into more extensive water defences, including natural or artificial lakes, dams and sluices. In older fortifications, such as hillforts, they are usually referred to simply as ditches, although the function is similar. In later periods, moats or water defences may be largely ornamental. They could also act as a sewer.
Mont-Saint-Michel is a tidal island and mainland commune in Normandy, France.
A tidal island is a raised area of land within a waterbody, which is connected to the larger mainland by a natural isthmus or man-made causeway that is exposed at low tide and submerged at high tide, causing the land to switch between being a promontory/peninsula and an island depending on tidal conditions.
Montreal, or Qal'at ash-Shawbak in Arabic, is a castle built by the Crusaders and expanded by the Mamluks, on the eastern side of the Arabah Valley, perched on the side of a rocky, conical mountain, looking out over fruit orchards below. The ruins are located next to the modern town of Shoubak in Jordan.
Vis is a town on the eponymous island in the Adriatic Sea in southern Croatia. Its population was 1,934 as of 2011. The town is the seat of the eponymous Vis municipality, one of the island's two municipalities. Both belong administratively to Split-Dalmatia County.
Japanese castles are fortresses constructed primarily of wood and stone. They evolved from the wooden stockades of earlier centuries and came into their best-known form in the 16th century. Castles in Japan were built to guard important or strategic sites, such as ports, river crossings, or crossroads, and almost always incorporated the landscape into their defenses.
A bastion fort or trace italienne is a fortification in a style that evolved during the early modern period of gunpowder when the cannon came to dominate the battlefield. It was first seen in the mid-fifteenth century in Italy. Some types, especially when combined with ravelins and other outworks, resembled the related star fort of the same era.
Mont Orgueil is a castle in Jersey that overlooks the harbour of Gorey; a port on the east coast of the Island. It is known as Gorey Castle by English-speakers, and lé Vièr Châté by Jèrriais-speakers. The castle was first referred to as 'Mont Orgeuil' in an ordnance survey made in 1462, when the castle was under French occupation in the late Middle Ages. The castle was the seat of royal authority on Jersey throughout the medieval period and served as the main fortress on the Island until the construction of Elizabeth Castle in 1594. It is classified as a Grade I listed building.
The existence of the earliest forts in India have been substantiated by documentation and excavation. In the medieval times, the architecture of the forts had both Hindu and Muslim influence. The forts constructed by the British initially opted for simple designs. The existing castles are continually modified and many of them are privately owned.
A water castle, sometimes water-castle, is a castle where natural or artificial water is part of its defences. (It can be entirely surrounded by water-filled moats or natural waterbodies such as island castles in a river or offshore. The term comes from European castle studies, mainly German Burgenkunde. When stately homes were built in such a location, or a Wasserburg was later rebuilt as a residential manor, the German term becomes Wasserschloss, lit. "water palace/manor".
Algajola is a commune in the Haute-Corse department of France on the island of Corsica.
South-Eastern Finland fortification system is an extensive defensive system formed by three concentric fortress chains in South-East Finland built by Russia in the 1790s. The purpose of the fortification system was to protect the capital of the Russian Empire, Saint Petersburg, from a possible Swedish attack.
The term lowland castle or plains castle describes a type of castle that is situated on a lowland, plain or valley floor, as opposed to one built on higher ground such as a hill spur. The classification is extensively used in Germany where about 34 percent of all castles are of the lowland type.
The Château de La Roche is a restored castle situated in the commune of Saint-Priest-la-Roche in the Loire département of France, 20 km from Roanne. The castle stands on an island in the lake formed by the Villerest dam.
Gardiki Castle is a 13th-century Byzantine castle on the southwestern coast of Corfu and the only surviving medieval fortress on the southern part of the island. It was built by a ruler of the Despotate of Epirus, and was one of three castles which defended the island before the Venetian era (1401–1797). The three castles formed a defensive triangle, with Gardiki guarding the island's south, Kassiopi Castle the northeast and Angelokastro the northwest
Mont-de-Huisnes German war cemetery is a military war grave mausoleum, located 1 km north of Huisnes-sur-Mer and a few kilometres southwest of Avranches, France. It presently contains in nearly 12,000 burials of German military personnel of World War II, plus some women and children. It is maintained and managed by the German War Graves Commission.
