Frankfurt am Main is the most populous city in the German state of Hesse. Its 773,068 inhabitants as of 2022 make it the fifth-most populous city in Germany. Located in the foreland of the Taunus on its namesake Main, it forms a continuous conurbation with Offenbach am Main; its urban area has a population of over 2.7 million. The city is the heart of the larger Rhine-Main metropolitan region, which has a population of more than 5.8 million and is Germany's second-largest metropolitan region after the Rhine-Ruhr region and the fourth largest metropolitan region by GDP in the European Union (EU). Frankfurt is one of the de facto four main capitals of the European Union, as it is home to the European Central Bank, one of the institutional seats of the European Union, while Frankfurt's central business district lies about 90 km (56 mi) northwest of the geographic center of the EU at Gadheim in Lower Franconia. Like France and Franconia, the city is named after the Franks. Frankfurt is the largest city in the Rhenish Franconian dialect area.