Sofia (/ˈsoʊfiə/) (Bulgarian: София, Sofiya,pronounced [ˈsɔfijɐ]) is the capital and largest city of Bulgaria. Sofia is the 14th largest city in the European Union with population of more than 1.2 million people. The city is located at the foot of Vitosha Mountain in the western part of the country, within less than 50 kilometres (31 mi) drive from the Serbian border.