Marycha
The 883rd longest river in the world
Marycha (Lithuanian: Seina) is a small river that serves as the natural Polish–Lithuanian and Lithuanian–Belarusian border. It starts around Puńsk, flows through the town of Sejny and passes through Pomorze Lake. It is a tributary of Czarna Hańcza. The river is known for its population of beavers.
Flows through: Poland.
River data from Wikidata (CC0); lengths normalised to a common unit.