Belgrade is the capital and largest city of Serbia. It is located at the confluence of the Sava and Danube rivers and at the crossroads of the Pannonian Plain and the Balkan Peninsula. The population of the Belgrade metropolitan area is 1,681,405 according to the 2022 census. It is one of the major cities of Southeast Europe and the third most populous city on the Danube river.
Belgrade is one of the oldest continuously inhabited cities in Europe and the world. One of the most important prehistoric cultures of Europe, the Vinča culture, evolved within the Belgrade area in the 6th millennium BC. In antiquity, Thraco-Dacians inhabited the region and, after 279 BC, Celts settled the city, naming it Singidūn.
Wikipedia https://en.wikipedia.org/wiki/Belgrade
Coordinates 44°49'4.127" N 20°27'24.83" E