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26-834: The drainage divide between the Toltén River drainage basin and the Valdivia River basin runs through the park and marks the boundary between the Cautín Province and the Valdivia Province . A portion of the park is included in the Bosques Templados Lluviosos de los Andes Australes Biosphere Reserve . The park protects Valdivian temperate rainforest habitat. Roble ( Nothofagus obliqua ) and Raulí ( Nothofagus alpina ) trees are found at lower elevations. Coihues occur in

52-934: A key problem in such canals is ensuring a sufficient water supply. Important examples are the Chicago Portage , connecting the Great Lakes and Mississippi by the Chicago Sanitary and Ship Canal , and the Canal des Deux Mers in France, connecting the Atlantic and the Mediterranean. The name is enshrined at the Height of Land Portage on the route from the Great Lakes in the Atlantic drainage basin to

78-985: A part of the southern boundary of the plain: the Eifel , Bergisches Land and the Sauerland . In the east the North German Plain spreads out beyond the Harz Mountains and Kyffhäuser further to the south as far as the Central Saxon hill country and the foothills of the Ore Mountains . It is known that the North German Plain was formed during the Pleistocene era as a result of the various glacial advances of terrestrial Scandinavian ice sheets as well as by periglacial geomorphologic processes. The terrain may be considered as part of

104-434: A series of rambling wooden plank boardwalks. Drainage divide A drainage divide , water divide , ridgeline , watershed , water parting or height of land is elevated terrain that separates neighboring drainage basins . On rugged land, the divide lies along topographical ridges , and may be in the form of a single range of hills or mountains , known as a dividing range . On flat terrain, especially where

130-758: Is drained by rivers that flow northwards into the North Sea or the Baltic and tributaries to the Rhine river that flows West. The Rhine, Ems , Weser , Elbe and Havel are the most important rivers which drain the North German Lowlands into the North Sea and created woods in their flood plains and folds, e.g. the Spreewald ("Spree Forest"). Only a small area of the North German Plain falls within

156-806: Is the bifurcation of the Orinoco in the north of South America , whose main stream empties into the Caribbean , but which also drains into the South Atlantic via the Casiquiare canal and Amazon River . Since ridgelines are sometimes easy to see and agree about, drainage divides may form natural borders defining political boundaries, as with the Royal Proclamation of 1763 in British North America which coincided with

182-529: Is used in Canada and the United States to refer to a drainage divide. It is frequently used in border descriptions, which are set according to the "doctrine of natural boundaries ". In glaciated areas it often refers to a low point on a divide where it is possible to portage a canoe from one river system to another. Drainage divides can be divided into three types: A valley-floor divide occurs on

208-680: The Urstromtäler , for example, between Havel and Finow in the Eberswalde Urstromtal . In marsh deltas such as the Okavango , the largest drainage area on earth, or in large lakes areas, such as the Finnish Lakeland , it is difficult to find a meaningful definition of a watershed. A bifurcation is where the watershed is effectively in a river bed, in a wetland, or underground. The largest watershed of this type

234-497: The Altes Land near Hamburg , which is characterised by relatively mild temperatures year round due to the proximity of the North Sea and lower Elbe river, providing excellent conditions for fruit production. Azonal vegetation complexes of moors, riparian forests, fens and water bodies originally stretched along the rivers Ems , Weser , Elbe , Havel and Spree . Distinctive salt marshes , tideflats and tidal reed beds in

260-746: The Black Sea and the Rienz into the Adriatic . Settlements are often built on valley-floor divides in the Alps. Examples are Eben im Pongau , Kirchberg in Tirol and Waidring (In all of these, the village name indicates the pass and the watershed is even explicitly displayed in the coat of arms). Extremely low divides with heights of less than two metres are found on the North German Plain within

286-714: The Hudson Bay drainage basin . North German Plain The North German Plain or Northern Lowland ( German : Norddeutsches Tiefland ) is one of the major geographical regions of Germany . It is the German part of the North European Plain . The region is bounded by the coasts of the North Sea and the Baltic Sea to the north, Germany's Central Uplands ( die Mittelgebirge ) to

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312-531: The estuaries existed permanently in the tidal zone of the North Sea coast. The natural vegetation of the North German Plain is thought to have been forest formed mainly by the dominant species European Beech (Fagetalia). According to Germany's Federal Agency for Nature Conservation, the BfN , the North German Plain consists of the natural regions listed below. Where possible, their names have been derived from authoritative English-language source(s), as indicated by

338-570: The Börde areas (Hildesheim Börde, Magdeburg Börde, with their fertile, loess soils). High-level bog peat can be found in the poorest soils, e.g. in the Teufelsmoor . In the loess areas of the lowland are found the oldest settlement locations in Germany ( Linear Pottery culture ). The northeastern part of the plain (Young Drift) is geomorphologically distinct and contains a multitude of lakes (e.g.

364-544: The Fulda Gap option was seen as the most likely invasion route because of easier and closer access to tactical and strategic goals important for an invasion of Western Europe. Of the two North German plain invasion options, the southern route of the attack, which had the better strategic opportunities, would have been led by the Soviet Third Shock Army . The plain's geography, which makes it suitable for

390-650: The Mueritz lake in the Mecklenburg Lake Plateau ) which are vestiges of the last ice age. The retreating glaciers left this landscape behind around 16,000 to 13,000 years ago. In comparison, the dry plains of northwestern Germany (Lower Saxony, western Schleswig-Holstein, and the Bochum area of North Rhine Westphalia) are more heavily weathered and levelled ( Old Drift ) as the last large scale glaciations here occurred at least 130,000 years ago. The region

416-592: The Old or Young Drift ( Alt- or Jungmoräne ), depending on whether or not it was formed by the ice sheets of the last glacial period, the Weichselian Ice Age . The surface relief varies from level to undulating. The lowest points are low moorlands and old marshland on the edge of the ridge of dry land in the west of Schleswig-Holstein (the Wilster Marsh is 3.5 m (11 ft) below sea level) and in

442-799: The bottom of a valley and arises as a result of subsequent depositions, such as scree , in a valley through which a river originally flowed continuously. Examples include the Kartitsch Saddle in the Gail valley in East Tyrol , which forms the watershed between the Drau and the Gail, and the divides in the Toblacher Feld between Innichen and Toblach in Italy , where the Drau empties into

468-568: The catchment area of the Oder and Neiße rivers which drain into the Baltic. The North Sea coast and the adjacent coastal areas of the facing East and North Frisian Islands are characterised by a maritime climate . South of the coast, a broad band of maritime and sub-maritime climate stretches from the east coast of Schleswig-Holstein to the western edges of the Central Uplands . To

494-405: The ground is marshy , the divide may be difficult to discern. A triple divide is a point, often a summit , where three drainage basins meet. A valley floor divide is a low drainage divide that runs across a valley , sometimes created by deposition or stream capture . Major divides separating rivers that drain to different seas or oceans are continental divides . The term height of land

520-936: The northwest of Lower Saxony (Freepsum, 2.3 m (7.5 ft) below sea level). The highest points may be referred to as Vistula and Hall glaciation terminal moraines (depending on the ice age which formed them) – e.g., on the Fläming Heath (200 m (660 ft) above sea level) and the Helpt Hills 179 m (587 ft)). Following the ice ages, rain-fed, raised bogs originated in western and northern Lower Saxony during warm periods of high precipitation (as influenced by Medieval Warm Period). These bogs were formerly widespread but much of this terrain has now been drained or otherwise superseded. The coastal areas consist of Holocene lake and river marshes and lagoons connected to Pleistocene Old and Young Drift terrain in various stages of formation and weathering. After or during

546-652: The references. During the Cold War , in the event of war between NATO and the Warsaw Pact , NATO military strategists identified the North German plain as an area that could have been used for two of three major invasion routes into Western Europe by Warsaw Pact forces. The third route was the Fulda Gap further south. The North German plain routes were the best attack options for an attacking army. However,

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572-494: The retreat of the glaciers, wind-borne sand often formed dunes, which were later fixed by vegetation. Human intervention caused the emergence of open heath such as the Lüneburg Heath , and measures such as deforestation and the so-called Plaggenhieb (removal of the topsoil for use as fertilizer elsewhere) caused a wide impoverishment of the soil ( Podsol ). The most fertile soils are the young marshes ( Auen-Vegen ) and

598-662: The ridgeline of the Appalachian Mountains forming the Eastern Continental Divide that separated settled colonial lands in the east from Indian Territory to the west. Another instance of a border matching a watershed in modern times involves the western border between Labrador and Quebec , as arbitrated by the privy council in 1927. Drainage divides hinder waterway navigation . In pre-industrial times, water divides were crossed at portages . Later, canals connected adjoining drainage basins;

624-609: The south east and east, the climate becomes increasingly subcontinental: characterised by temperature differences between summer and winter which progressively increase away from the tempering effect of the ocean. Locally, a drier continental climate can be found in the rain shadow of the Harz and some smaller areas of upland like the Drawehn and the Fläming . Special microclimates occur in bogs and heathlands and, for example, in

650-981: The south, by the Netherlands to the west and Poland to the east. In the west, the southern boundary of the North German Plain is formed by the Lower Saxon Hills : specifically the ridge of the Teutoburg Forest , the Wiehen Hills , the Weser Hills and the Lower Saxon Börde, which partly separate it from that area of the Plain known as the Westphalian Lowland . Elements of the Rhenish Massif also act

676-554: The wettest areas. At higher elevations, forests are dominated by the Araucarias ( Araucaria araucana ). The park's forests provide habitat for wildlife such as pumas , chillas , culpeos , pudúes , coypus , Harris's hawks , lesser grisons , Molina's hog-nosed skunks , and the rare monitos del monte . The Termas Geométricas hot springs system is located in a ravine in the park forest. The system consists of 60 hot springs and cold waterfalls that are accessible to visitors on

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