Located in southeastern Europe, Moldova is bordered on the west by Romania and on the north, south, and east by Ukraine. Most of its territory lies between the area's two main rivers, the Dniester and the Prut. The Dniester forms a small part of Moldova's border with Ukraine in the northeast and southeast, but it mainly flows through the eastern part of the country, separating Bessarabia and Transnistria. The Prut River forms Moldova's entire western boundary with Romania.