Talk:Lower course
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Switzerland The Rhine's origins are in the Swiss Alps in the canton of Graubünden, where its two main initial tributaries are called Vorderrhein and Hinterrhein. The Vorderrhein (anterior Rhine) springs from Lake Tuma near the Oberalp Pass and passes the impressive Ruinaulta (the Swiss Grand Canyon). The Hinterrhein (posterior Rhine) starts from the Paradies glacier near the Rheinquellhorn at the southern border of Switzerland. One of the latter tributaries originates in Val di Lei in Italy. Both tributaries meet near Reichenau, still in Graubünden. From Reichenau, the Rhine flows north as the Alpenrhein passing Chur and forming the frontier with Liechtenstein and then Austria, and then emptying into Lake Constance. Emerging from Lake Constance, flowing west as the Hochrhein it passes the Rhine Falls and is joined by the Aare river which more than doubles its water discharge to an average of nearly 1,000 cubic meters per second. It forms the boundary with Germany until it turns north at the so-called Rhine knee at Basel.
[edit] Germany and France
Past Basel, as the Upper Rhine, it forms the southern part of the border between Germany and France in a wide valley, before entering Germany exclusively at Rheinstetten, near Karlsruhe.
At over 1000 kilometres in length, the Rhine is the longest river primarily within Germany. It is here that the Rhine encounters some of its main tributaries, such as the Neckar, the Main and later the Moselle, which contributes an average discharge of over 300 cubic meters per second.
Between Bingen and Bonn, the Middle Rhine flows through the Rhine Gorge, a formation created by erosion, which happened at about the same rate as an uplift in the region, leaving the river at about its original level, and the surrounding lands raised. This gorge is quite deep, and is the stretch of the river known for its many castles and vineyards. It is a UNESCO World Heritage Site (2002) and known as "the romantic Rhine" with more than 40 castles and fortresses from the Middle Ages (see links) and many lovely wine villages.
Though many industries can be found along the Rhine up into Switzerland, it is along the Lower Rhine in the Ruhr area that the bulk of them are concentrated, as the river passes the major cities of Cologne, Düsseldorf, and Duisburg. The Ruhr, which joins the Rhine at Duisburg, is surprisingly clean, given the amount of industry on its banks, and is used for drinking water. It adds another 70 cubic meters per second to the Rhine. However, other rivers from the Ruhr area, above all the Emscher, still bring a considerable degree of pollution. Approaching the Dutch border, the Rhine now has an average discharge of 2,290 cubic metres per second and an average width of more than 300 metres. .
[edit] The Netherlands
The Rhine then turns west and enters the Netherlands, where together with the rivers Meuse and Scheldt it forms an extensive delta. Crossing the border into the Netherlands at Spijk, close to Nijmegen and Arnhem the Rhine is at its widest, but the river then splits into three main distributaries: the Waal, Nederrijn ("Lower Rhine") and IJssel branches.
From here the situation becomes more complicated, as the name "Rhine" no longer coincides with the main flow of water. Most of the Rhine water (two thirds) flows farther west through the Waal and then via the Merwede and Nieuwe Merwede and, merging with the Meuse, through the Hollands Diep and Haringvliet estuaries into the North Sea. The Beneden Merwede branches off near Hardinxveld-Giessendam and continues as the Noord, to join the Lek near the village of Kinderdijk to form the Nieuwe Maas, then flows past Rotterdam and continues via Het Scheur and the Nieuwe Waterweg to the North Sea. The Oude Maas branches off near Dordrecht, farther down rejoining the Nieuwe Maas to form Het Scheur.
The other third portion of the water flows through the Pannerdens Kanaal and redistributes in the IJssel and Nederrijn. The IJssel branch carries one ninth of the water volume north into the IJsselmeer (a former bay), while the Nederrijn flows west parallel to the Waal and carries approximately two ninths of the flow. However, at Wijk bij Duurstede the Nederrijn changes its name and becomes the Lek. It flows farther west to rejoin the Noord into the Nieuwe Maas and to the North Sea.
The name "Rhine" from here on is used only for smaller streams farther to the north which together once formed the main river Rhine in Roman times. Though they retained the name, these streams do not carry water from the Rhine anymore, but are used for draining the surrounding land and polders. From Wijk bij Duurstede, the old north branch of the Rhine is called Kromme Rijn ("Crooked Rhine") and past Utrecht, first Leidse Rijn ("Rhine of Leiden") and then Oude Rijn ("Old Rhine"). The latter flows west into a sluice at Katwijk, where its waters can be discharged into the North Sea. This branch once formed the line along which the Upper Germanic limes were built.
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