The river Neris () or Vilija (Belarusian: Ві́лія, Vilija, Polish: Wilia) rises in northern Belarus. It flows westward, passing through Vilnius (Lithuania's capital) and in the south-centre of that country it flows into the Nemunas (Neman) from the right bank, at Kaunas, as its main tributary. Its length is 510 km (320 mi).
