The Mūša (; ) is a river in Northern Lithuania and Southern Latvia (Zemgale region). At its confluence with the river Nemunėlis () in Latvia, near the city of Bauska, the river Lielupė is formed. The river is long, with in Lithuania and in Latvia.
References LIETUVOS RESPUBLIKOS UPIŲ IR TVENKINIŲ KLASIFIKATORIUS (Republic of Lithuania- River and Pond Classifications). Ministry of Environment (Lithuania). Accessed 2011-11-17.