The Nevėžis is the sixth longest river in Lithuania and one of the main tributaries of the Nemunas. The 209 km (130 mi) long Nevėžis flows entirely within Lithuania. Among the rivers that flow exclusively within Lithuania's borders, the Nevėžis is the second longest, after the Šventoji. Its source is in the Anykščiai District Municipality. The river first flows in a northwesterly direction, but at Panevėžys it turns southwest, and passing Kėdainiai, flows into the Neman just west of Kaunas near Raudondvaris.

The Neman, Niemen, Nyoman, Nemunas or Memel is a river in Europe that rises in central Belarus and flows through Lithuania then forms the northern border of Kaliningrad Oblast, Russia's western exclave, which specifically follows its southern channel. It drains into the Curonian Lagoon, narrowly connected to the Baltic Sea. The 937 km (582 mi) long Neman is a major Eastern European river. It flows generally west to Grodno within 12 kilometres (7.5 mi) of the Polish border, north to Kaunas, then westward again to the sea.