The Lower Rhine Bay (), 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 a ...

plain In geography, a plain, commonly known as flatland, 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 ...

in the German state of

North Rhine-Westphalia North Rhine-Westphalia or North-Rhine/Westphalia, commonly shortened to NRW, is a States of Germany, state () in Old states of Germany, Western Germany. With more than 18 million inhabitants, it is the List of German states by population, most ...

that cuts into the

Rhenish Massif The Rhenish Massif, Rhine Massif or Rhenish Uplands (, : 'Rhenish Slate Uplands') is a geologic massif in western Germany, eastern Belgium, Luxembourg and northeastern France. It is drained centrally, south to north by the river Rhine and a few ...

. 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 ecological point of view, the naturally occurring flora and ...

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 (, ), is a densely populated area of Germany lying between the cities of Bonn, Aachen, and Düsseldorf/Neus ...

around the city of

Cologne Cologne ( ; ; ) is the largest city of the States of Germany, German state of North Rhine-Westphalia and the List of cities in Germany by population, fourth-most populous city of Germany with nearly 1.1 million inhabitants in the city pr ...

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 ; ; ), 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; and metonymy, where ...

'', 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.'' 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 in the historic

Bergisches Land The Bergisches Land (, ) is a low mountain range in the state of North Rhine-Westphalia, Germany, east of the Rhine and south of the Ruhr. The landscape is shaped by forests, meadows, rivers and creeks and contains over twenty artificial lakes ...

. To the south, are the Lower

Middle Rhine Middle Rhine (, ; kilometres 529 to 660 of the Rhine) is the section of the Rhine between Bingen and Bonn in Germany. It flows through the Rhine Gorge (), a formation created by erosion, which happened at about the same rate as an uplift i ...

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

. To the north, the

loess A loess (, ; from ) is a clastic rock, 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 loesses or similar deposition (geology), deposits. A loess ...

strip forms the boundary with the Lower Rhine Plain. The surface of the landscape is flat or gently rolling and divided by

tectonically Tectonics ( via Latin ) are the processes that result in the structure and properties of the Earth's crust and its evolution through time. The field of ''planetary tectonics'' extends the concept to other planets and moons. These processes ...

-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 or Maas 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 total length of . History From 1301, the upper ...

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