Flag of Bonn, Germany

Bonn (German pronunciation: [bɔn] ) is a federal city in the German state of North Rhine-Westphalia, located on the banks of the Rhine. With a population exceeding 300,000, it lies about 24 km (15 mi) south-southeast of Cologne, in the southernmost part of the Rhine-Ruhr region. This metropolitan area, Germany's largest, is also the second largest in the European Union by GDP, with over 11 million residents. Bonn served as the capital of West Germany from 1949 until 1990 and was the seat of government for reunified Germany until 1999, when the government relocated to Berlin. The city holds historical significance as the birthplace of Germany's current constitution, the Basic Law. Founded in the 1st century BC as a settlement of the Ubii and later part of the Roman province Germania Inferior, Bonn is among Germany's oldest cities. It was the capital city of the Electorate of Cologne from 1597 to 1794 and served as the residence of the Archbishops and Prince-electors of Cologne. The period during which Bonn was the capital of West Germany is often referred to by historians as the Bonn Republic. Following the German reunification, a political compromise known as the Berlin-Bonn Act ensured that the German federal government retained a significant presence in Bonn. As of 2019, approximately one-third of all ministerial jobs remain in the city. Bonn is considered an unofficial secondary capital of Germany and is the location of the secondary seats of the president, the chancellor, and the Bundesrat. Bonn is also the location of the primary seats of six federal ministries and twenty federal authorities. The city's title as Federal City (German: Bundesstadt) underscores its political importance. The global headquarters of Deutsche Post DHL and Deutsche Telekom, both DAX-listed corporations, are in Bonn. The city is home to the University of Bonn and a total of 20 United Nations institutions, the highest number in all of Germany. These institutions include the headquarters for Secretariat of the UN Framework Convention Climate Change (UNFCCC), the Secretariat of the UN Convention to Combat Desertification (UNCCD), and the UN Volunteers programme. Birthplace of composer Ludwig van Beethoven, a centre of Rhenish carnival, and its geography by the Middle Rhine make it an important tourist destination.