The Rhine-Ruhr metropolitan region (German: Metropolregion Rhein-Ruhr) is the largest metropolitan region in Germany, with over ten million inhabitants. A polycentric conurbation with several major urban concentrations, the region covers an area of 7,268 square kilometres (2,806 sq mi), entirely within the federal state of North Rhine-Westphalia. The Rhine-Ruhr metropolitan region spreads from the Ruhr area (Dortmund-Essen-Duisburg-Bochum) in the north to the urban areas of the cities of Mönchengladbach, Düsseldorf (the state capital), Wuppertal, Leverkusen, Cologne (the region's largest and Germany's fourth largest city), and Bonn in the south. The location of the Rhine-Ruhr at the heart of the European Blue Banana makes it well connected to other major European cities and metropolitan areas such as the Randstad, the Flemish Diamond and the Frankfurt Rhine Main Region.
Rhine-Ruhr metropolitan region
|State|| North Rhine-Westphalia
|• Metro||7,268 km2 (2,806 sq mi)|
|Highest elevation||494 m (1,621 ft)|
|Lowest elevation||20 m (70 ft)|
|• Metro density||1,500/km2 (3,800/sq mi)|
|Time zone||UTC+1 (CET)|