The Neman, Nemunas, Nyoman, Niemen or Memel, is a major Eastern European river. It rises in Belarus and flows through Lithuania before draining into the Curonian Lagoon, and then into the Baltic Sea at Rusnė Island. It begins at the confluence of two smaller tributaries, about 15 kilometers (9 mi) southwest of the town of Uzda in central Belarus, and about 55 km (34 mi) southwest of Minsk. In its lower reaches it forms the border between Lithuania and Russia's Kaliningrad Oblast. It also, very briefly, forms part of the Belarus–Lithuania border. The largest river in Lithuania, and the third-largest in Belarus, the Neman is navigable for most of its 900 km (560 mi) length.