Romania is a sovereign state located in Southeastern Europe. It borders the Black Sea, Bulgaria, Ukraine, Hungary, Serbia, and Moldova. It has an area of 238,391 square kilometres and a temperate-continental climate. With 19.94 million inhabitants, the country is the seventh most populous member state of the European Union. Its capital and largest city, Bucharest, is the sixth largest city in the EU. The River Danube, Europe's second longest river, rises in Germany and flows southeastwards for a distance of 2,857 km, coursing through ten countries before emptying in Romania's Danube Delta. The Carpathian Mountains, with their tallest peak Moldoveanu at 2,544 m, cross Romania from the north to the southwest.