RomaniaRomaniais a republic in Southeast Europe which borders the Black Sea, Bulgaria, Ukraine, Hungary, Serbia, and Moldova.Bucharestis the capital and largest city of Romania, as well as its cultural, industrial, and financial centre.Cluj-Napocacommonly known as Cluj, is the second most populous city in Romania, after the national capital Bucharest, and the seat of Cluj County in the northwestern part of the country.Constanța, historically known as Tomis, is the oldest continuously inhabited city in Romania.The Danubeis Europe's second-longest river, after the Volga River, and also the longest river in the European Union region. It is located in Central and Eastern Europe. Originating in Germany, the Danube flows southeast for 2,860 km (1,780 mi), passing through or touching the border of Austria, Slovakia, Hungary, Croatia, Serbia, Romania, Bulgaria, Moldova and Ukraine before emptying into the Black Sea. Its drainage basin extends into nine more countries.The Carpathiansare a mountain system located in eastern Europe, and the source of the Dniester, Tisza and Vistula Rivers. They form the natural border between Slovakia and southern Poland, and then extend southward through Ukraine and into Romania.Moldoveanu Peakat 2,544 metres, is the highest mountain in Romania.