Lower Rhine Bay

The Lower Rhine Bay (German: Niederrheinische Bucht), sometimes called the Lower Rhine Bight, is a lowland plain in the German state of North Rhine-Westphalia that cuts into the Rhenish Massif. From a natural region perspective it is a major unit group which includes the Cologne Lowland around the city of Cologne 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, for the entire region.

The Lower Rhine Bay covers an area of 3,584.4 km².