The Lower Rhine Bay (german: Niederrheinische Bucht), sometimes called the Lower Rhine Bight,Luttig, G.W. (ed.), ''General Geology of the Federal Republic of Germany'', Nagel u. Obermiller, 1980, pp. 29 and 44. is a

lowland Upland and lowland are conditional descriptions of a plain based on elevation above sea level. In studies of the ecology of freshwater rivers, habitats are classified as upland or lowland. Definitions Upland and lowland are portions of ...

plain In geography, a plain is a flat expanse of land that generally does not change much in elevation, and is primarily treeless. Plains occur as lowlands along valleys or at the base of mountains, as coastal plains, and as plateaus or uplands ...

in the German state of

North Rhine-Westphalia North Rhine-Westphalia (german: Nordrhein-Westfalen, ; li, Noordrien-Wesfale ; nds, Noordrhien-Westfalen; ksh, Noodrhing-Wäßßfaale), commonly shortened to NRW (), is a States of Germany, state (''Land'') in Western Germany. With more tha ...

that cuts into the Rhenish Massif. From a

natural region A natural region (landscape unit) is a basic geographic unit. Usually, it is a region which is distinguished by its common natural features of geography, geology, and climate. From the ecology, ecological point of view, the naturally occurring fl ...

perspective it is a major unit group which includes the

Cologne Lowland The Cologne Lowland,Dickinson 1953, 35, 461–64, 466–73.Elkins 1968, 229. also called the Cologne Bay or, less commonly, the Cologne Bight (german: Kölner Bucht), is a densely populated area of Germany lying between the cities of Bonn, Aachen ...

around the city of

Cologne Cologne ( ; german: Köln ; ksh, Kölle ) is the largest city of the German western States of Germany, state of North Rhine-Westphalia (NRW) and the List of cities in Germany by population, fourth-most populous city of Germany with 1.1 m ...

as well as the land lying to the west and, in a clearly narrower strip of land, to the east of the central Cologne plain. That said, the term "Cologne Bay" or "Cologne Bight" is occasionally used, ''

pars pro toto ''Pars pro toto'' (, ), , is a figure of speech where the name of a ''portion'' of an object, place, or concept is used or taken to represent its entirety. It is distinct from a merism, which is a reference to a whole by an enumeration of parts; ...

'', for the entire region. The Lower Rhine Bay covers an area of 3,584.4 km².Meynen, E. and Schmithüsen, J., ''

Handbuch der naturräumlichen Gliederung Deutschlands The ''Handbook of Natural Region Divisions of Germany'' (german: Handbuch der naturräumlichen Gliederung Deutschlands) was a book series resulting from a project by the former German Federal Institute for Regional Studies ('' Bundesanstalt für La ...

.'' Bundesanstalt für Landeskunde, Remagen/Bad Godesberg, 1953–1962 (9 issues in 8 books, updated map at 1:1,000,000 scale with major units, 1960).

Location and boundaries

The Lower Rhine Bay is bordered to the east by the Berg Plateaux (''Bergische Hochflächen''), the western slopes of the

Süder Uplands The Süder Uplands Bergisches Land The Bergisches Land (, ''Berg Country'') is a low mountain range region within the state of North Rhine-Westphalia, Germany, east of Rhine river, south of the Ruhr. The landscape is shaped by woods, meadows, rivers and creeks and contains over ...

. To the south, are the Lower

Middle Rhine Between Bingen and Bonn, Germany, the river Rhine flows as the Middle Rhine (german: Mittelrhein) 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 ...

region including the Pleiser Hills,

Siebengebirge The (), occasionally Sieben Mountains or Seven Mountains, are a hill range of the German Central Uplands on the east bank of the Middle Rhine, southeast of Bonn. Description The area, located in the municipalities of Bad Honnef and Königswin ...

and Lower Middle Rhine Valley, to the southwest is the

Eifel The Eifel (; lb, Äifel, ) is a low mountain range in western Germany and eastern Belgium. It occupies parts of southwestern North Rhine-Westphalia, northwestern Rhineland-Palatinate and the southern area of the German-speaking Community of ...

. To the north, the

loess Loess (, ; from german: Löss ) is a clastic, predominantly silt-sized sediment that is formed by the accumulation of wind-blown dust. Ten percent of Earth's land area is covered by loess or similar deposits. Loess is a periglacial or aeolian ...

strip forms the boundary with the

Lower Rhine Plain The Lower Rhine Plain (German: ''Niederrheinisches Tiefland'') is one of the natural regions of Germany and lies on either side of the Rhine north of the city of Düsseldorf. Geography The Lower Rhine Plain is bordered in the south by the Lower ...

. The surface of the landscape is flat or gently rolling and divided by

tectonically Tectonics (; ) are the processes that control the structure and properties of the Earth's crust and its evolution through time. These include the processes of mountain building, the growth and behavior of the strong, old cores of continents k ...

-formed ridges and valleys that mainly run from southeast to northwest. Characteristic of the area is the blanket of

west of the Rhine deposited by the prevailing westerly winds from the

Meuse The Meuse ( , , , ; wa, Moûze ) or Maas ( , ; li, Maos or ) is a major European river, rising in France and flowing through Belgium and the Netherlands before draining into the North Sea from the Rhine–Meuse–Scheldt delta. It has a t ...

gravels and the heathland east of the river which is covered with coarse-grained sands.

References

{{coord missing, North Rhine-Westphalia Regions of North Rhine-Westphalia North German Plain