Agger Tange ("tange" is Danish for " isthmus " or " panhandle ") is a peninsula located between the Limfjord and the North Sea . Agger Tange protrudes from the North Jutlandic Island , immediately south of the village Agger in Thy .
13-575: As the name implies, Agger Tange was originally an isthmus , but North Sea storms breached the tombolo in the 1800s, creating two peninsulas, north and south. The north peninsula retained the name Agger Tange, although it was no longer an isthmus. The south peninsula became known as Harboøre Tange . The two peninsulas are separated by the Thyborøn Channel, facilitating ship traffic through the Limfjord canal. The sand tombolo of Agger Tange
26-453: A particularly advantageous shortcut for marine transport. For example: Land bridge In biogeography , a land bridge is an isthmus or wider land connection between otherwise separate areas, over which animals and plants are able to cross and colonize new lands. A land bridge can be created by marine regression , in which sea levels fall, exposing shallow, previously submerged sections of continental shelf ; or when new land
39-417: Is a Ramsar wetland , Special Area of Conservation , and Special Protection Area . The beach meadows on Agger Tange are home to many species of birds, both domestic and migrating birds. As most of them are nesting on the ground, the meadows are not accessible in the spring and early summer, from 1 April to 15 July. The wetlands, however, are not to be disturbed at any time of year. Agger Tange constitutes
52-429: Is a narrow piece of land connecting two larger areas across an expanse of water by which they are otherwise separated. A tombolo is an isthmus that consists of a spit or bar , and a strait is the sea counterpart of an isthmus, a narrow stretch of sea between two landmasses that connects two larger bodies of water. Isthmus and land bridge are related terms, with isthmus having a broader meaning. A land bridge
65-399: Is an isthmus connecting Earth's major land masses. The term land bridge is usually used in biogeology to describe land connections that used to exist between continents at various times and were important for the migration of people and various species of animals and plants, e.g. Beringia and Doggerland . An isthmus is a land connection between two bigger landmasses, while a peninsula
78-540: Is created by plate tectonics ; or occasionally when the sea floor rises due to post-glacial rebound after an ice age . In the late 19th and early 20 centuries, vanished land bridges were an explanation for observed affinities of plants and animals in distant locations. Such scientists as Joseph Dalton Hooker noted puzzling geological, botanical, and zoological similarities between widely separated areas, and proposed land bridges between appropriate land masses that allowed species to spread between land masses. In geology,
91-609: Is rather a land protrusion that is connected to a bigger landmass on one side only and surrounded by water on all other sides. Technically, an isthmus can have canals running from coast to coast (e.g. the Panama Canal ), and thus resemble two peninsulas; however, canals are artificial features distinguished from straits . The world's major isthmuses include: Of historic importance were: The cities of Auckland , Madison , Manila , and Seattle are located on isthmuses. Canals are often built across isthmuses, where they may be
104-436: The 1850s, again due to natural siltation. A similar breach occurred during a storm in 1862 at the nearby town of Thyborøn , south of Agger. This breach became known as the Thyborøn Channel, and to stop further erosion, both the Thyborøn Channel and the entire Agger Tange has later been fortified with coastal protection. The southern part of the breached tombolo, across the Thyborøn Channel, is known as Harboøre Tange, referring to
117-552: The Thyborøn Channel was secured and improved to serve seafaring traffic better. In World War II, during the German occupation of Denmark , Agger Tange became part of the Atlantic Wall with several bunker fortifications. The Danish State owns 2,400 ha on Agger Tange and Harboøre Tange that was made a protected area in 1984. Agger Tange is part of Natura 2000 -Area 28 with Nissum Bredning , Skibsted Fjord , and Agerø . It
130-524: The concept was first proposed by Jules Marcou in Lettres sur les roches du Jura et leur distribution géographique dans les deux hémisphères ("Letters on the rocks of the Jura [Mountains] and their geographic distribution in the two hemispheres"), 1857–1860. Hypothesized land bridges included: The theory of continental drift provided an alternate explanation that did not require land bridges. However
143-723: The railroad town of Harboøre at the south base of the peninsula. The flooding event in 1825, separated the northernmost part of Jutland from the mainland, thus creating the North Jutlandic Island . The breach made it possible to sail from the North Sea to the Kattegat , shortcutting the Skagerrak Sea, and the Agger Channel and Thyborøn Channel soon became important for international traffic. In 1875,
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#1732766178628156-514: The southernmost part of Thy National Park , and is sometimes referred to as "the main gate" of the national park. Close to the harbor at the southern tip of the peninsula, is an unmanned information house called Svanholmhus with various facilities in connection to the national park. 56°44′0″N 8°14′11″E / 56.73333°N 8.23639°E / 56.73333; 8.23639 Isthmus An isthmus ( / ˈ ɪ s m ə s , ˈ ɪ s θ m ə s / ; pl. : isthmuses or isthmi )
169-515: Was created around 1100 AD, as a result of natural siltation . The North Sea coast is often windy and fierce, and Agger Tange has experienced many smaller floods during storms. In 1825, a severe storm breached and created what became known as the Agger Channel (in Danish: Agger Kanal or Aggerkanalen ), effectually merging the North Sea with the brackish Limfjord permanently. The channel gradually widened, but closed up again during
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