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Drainage basin of the Nahe river and its tributaries
|Length||125,1 km |
|Basin area||4,067 km2 (1,570 sq mi) |
It rises in the area of Nohfelden (Saarland), flowing through Rhineland-Palatinate and joining the Rhine river in Bingen. Its length is 125 kilometres (78 mi). Towns along the Nahe include Idar-Oberstein, Kirn, Bad Kreuznach and Bingen.
The drainage basin of the river covers an area of 4,067 km². Due to this relatively large area compared to the river's length high floods can occur along its middle and lower course within only a few hours, however flowing off also quickly. In 1993 and 1995 in Bad Kreuznach a flow of more than 1,000 m³/s was measured and more than 1,300 m³/s at its mouth into the River Rhine.
The dimensions of the drainage basin are shown in the map. Its boundaries clock-wise, beginning in the East:
- the highlands of the Rheinhessische Schweiz as drainage divide to the Rhine
- the Donnersberg massif as drainage divide to the rivers Selz and Rhine
- the North Palatine Uplands as drainage divide to the rivers Pfrimm and Rhine eastwards as well as to the rivers Wallhalb and Schwarzbach (Blies) southwards
- the Hunsrück as drainage divide to the rivers Prims, Blies and Saar in the South respectively to the Moselle in the North
- the mountains of the Binger Wald (Bingen forest) as drainage divide to the Rhine towards North
Geology and Wildlife 
The rocks in the Nahe region are predominantly of Cisuralian (early Permian) age and part of the Rotliegendes. At that time, an impetuous volcanism appeared in the region. Huge deposits of the reddish volcanic rock Rhyolite and of the more alkaline volcanic rock Andesite were left. The valleys of the Nahe and its tributaries have been being formed since 2.6 million years ago during the Quaternary, the geologically latest period, as a result of ground heaving of the surrounding mountains of Hunsrück and North Palatine Uplands. This led to a steep decline of all waters and hence to strong erosion activities. Particularly strong erosion occurred in warmer melting periods during the ice ages, when tundra climate reigned and the soil was not protected by a dense cover of vegetation. Depending on the underground, narrow gorges with cliffy precipices arose in areas with hard volcanic rocks or wide gentle valleys with flood plains in areas with soft sedimentary deposits. The frequent change between both forms is charming along the Nahe River.
In the Nahe valley a huge number of thermophile species appear which usually can only be found in the mediterranean region or Eurasian steppe habitats. Characteristical species of plants are e. g. Alyssum montanum, Aster linosyris ("Goldilocks Aster"), Dictamnus albus ("White Dittany"), Dianthus grationopolitanus ("Cheddar Pink"), Gagea bohemica subsp. saxatilis ("Early-Star-of-Bethlehem"), Galium glaucum ("Glaucous Bedstraw"), Oxytropis pilosa or Stipa tirsa. These plants immigrated in a postglacial warm period to Europe but became extinct in most regions when the climate changed again to significantly cooler and more humid conditions. They only survived in small but still warm and dry places due to special geographic situations. In the Nahe valley and its tributaries these are mostly rocky precipices towards South or South-East, furthermore sunny slopes with shrubs, bushes and dry broad-leaved forests. On hot summer days the soil temperatures in these places can reach 60°C/140°F and above with truly steppe-like circumstances. A characteristical thermophile animal species is the insulated population of the dice snake (Natrix tessellata) that exists along the Nahe. The snake is very addicted to water and captures small fishes.
Places of botanical and/or zoological significance are classified as nature protection areas and accompany the course of the Nahe River. For instance can be mentioned the "Hellberg" near Kirn, the "Flachsberg" near Martinstein, the "Heimberg" near Waldböckelheim, the "Gangelsberg" near Duchroth and the "Rotenfels" as well as the "Rheingrafenstein" near Bad Münster am Stein.
The Nahe region offers various touristic attractions:
Nahe bicycle route – The route leads along the river from its spring to its entry.
Castles and monasteries – On the heights on both shores numerous medieval castles and abbeys can be visited, most of them fallen into ruin. Most noted are the Kyrburg Castle in Kirn, the castles Ebernburg and Rheingrafenstein in Bad Münster am Stein-Ebernburg and the Klopp Castle in Bingen. The monastery ruin of Disibodenberg, located on top of a hill between the junction of the Nahe and the Glan, was founded at the beginning of the 8. century by Saint Disibod, an Irish missionary. Saint Hildegard of Bingen, a famous Christian mystic, also lived here for a while.
Gemstone town Idar-Oberstein - The town is famous for its historic gemstone mines and related trades. Some of them are open to visitors. The German Gemstone Museum boasts many gemstone exhibits.
Bad Kreuznach - The baths which give the town its name contain the noble gas radon, with supposedly curative properties. Also famous are the historic "bridge houses" built on a bridge across the Nahe.
Saline valley - Between Bad Münster am Stein and Bad Kreuznach the scenic valley of the Nahe bears some bath sites with hydrothermal and saline springs. Graduation towers, formerly used for salt production, are regarded as having beneficial health effects. The so-called "Rotenfels" (red rock), a steep cliff nearby with a height of 202 meters and a length of 1,200 meters was formed by the Nahe.
The region is accessible via federal highway B41 which is connected to the motorways A60/A61 in the East and A62 in the West. Moreover, there is a railway line along the Nahe with regular connections between Mainz and Saarbrücken and stations in all bigger towns. Some forty kilometers northern the Frankfurt-Hahn Airport is located in the Hunsrück, offering daily flights to London Stansted and further weekly and seasonal connections.
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