Romania is in southeast Europe and is slightly smaller than Oregon. The Carpathian Mountains divide Romania's upper half from north to south and connect near the center of the country with the Transylvanian Alps, running east and west. North and west of these ranges lies the Transylvanian plateau, and to the south and east are the plains of Moldavia and Walachia. In its last 190 mi (306 km), the Danube River flows through Romania only. It enters the Black Sea in northern Dobruja, just south of the border with Ukraine.