Ruse (also transliterated as Rousse or Russe; Bulgarian:Русе, pronounced [ˈrusɛ]), and historically also known as Rustchuk/Ruschuk, is the fifth largest city in Bulgaria. Ruse is located in the northeastern part of the country, on the right bank of the Danube, opposite the Romanian city of Giurgiu, approximately 75 km (47 mi) south of Bucharest, 200 km (124 mi) from the Bulgarian Black Sea Coast and 300 km (186 mi) from the capital Sofia. It is the most significant Bulgarian river port, serving an important part of the international trade of the country.