The river flows for 51 km along the border between the Kaliningrad Oblast, an exclave of Russia, and Lithuania.

Major towns and cities along the river, from the Nemunas to the source, are: Kudirkos Naumiestis, Pilviškiai, Marijampolė and Kalvarija.

Its main tributaries are: (left) Rausvė, Širvinta, and (right) Szelmentka, Dovinė, Pilvė, Višakis, Nova and Siesartis.

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