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North Rhine-Westphalia is the westernmost and - in terms of population and economic output - the largest Federal State of Germany. North Rhine-Westphalia has over 18 million inhabitants, contributes about 22% of Germany's gross domestic product and comprises a land area of 34,083 km² (13,158 square miles). North Rhine-Westphalia is situated in the Western part of Germany and shares borders with Belgium and the Netherlands. It has borders with the German states of Lower Saxony to the North and Northeast, Rhineland-Palatinate to the Southwest and Hesse to the Southeast.

The state is centred on the sprawling Rhine-Ruhr urbanised region, which contains the cities of Düsseldorf, Bonn and Cologne as well as the Ruhr Area industrial complex. The Ruhr area consists of, among others, the cities of Dortmund, Essen, Duisburg, Bochum, Gelsenkirchen and Oberhausen.

The state's area covers a maximum distance of 291 km from north to south, and 266 km from east to west. The total length of the state's borders is 1,645 km. The following countries and states have a border with North Rhine-Westphalia: Belgium (99 km), The Netherlands (387 km), Lower Saxony (583 km), Hesse (269 km), Rhineland Palatinate (307 km) For many people North Rhine-Westphalia is synonymous with industrial areas and agglomerating cities. But the largest part of the state is used for agriculture (almost 52%), forests cover 25%. The southern parts of the Teutoburg Forest are located in the northeast. In the southwest, Nordrhein-Westafalen shares in a small part of the Eifel, located on the borders with Belgium and Rheinland-Pfalz. The southeast is occupied by the sparsely populated regions of Sauerland and Siegerland. The northwestern areas of the state are part of the Northern European Lowlands.

The most important rivers that run at least partially through North Rhine-Westphalia include: Rhine, Ruhr, Ems, Lippe and Weser. The Pader, which runs only through the city of Paderborn, is considered the shortest river in Germany.