Río Negro Department (Spanish: Departamento de Río Negro, Spanish pronunciation: [ˈri.o ˈneɣɾo]) is a department of the northwestern region of Uruguay. It has an area of 9,282 km (3,584 sq mi) and a population of 57,334. Its capital is Fray Bentos. It borders Paysandú Department to the north, Tacuarembó Department to the east, Durazno Department to the southeast, Soriano Department to the south and has the Río Uruguay flowing at its west, separating it from Argentina.