
Country: Germany Cologne is part of the Rhine-Ruhr metropolitan region, the European Union’s second-largest metropolitan area by GDP. More than one million people live in the city proper, while over 3.1 million residents call the wider Cologne Bonn urban region home. Cologne is North Rhine-Westphalia’s largest city and Germany’s fourth-most populous, extending along the Rhine’s left bank between Düsseldorf and Bonn.
