Motława

Motława is a river in Eastern Pomerania in Poland. The source is in Szpęgawskie Lake, northeast from the town of Starogard Gdański. It goes through Rokickie Lake to Martwa Wisła, a branch of the Vistula. The total length of the river is estimated at 68 km, with an area of 1511.3 km².The city of Gdańsk is situated at its mouth in the Martwa Wisła. In Gdańsk, the Motława ferry crosses the river, a service that has run since the year 1687.The Polish name Motława is derived from the Old Prussian language. In German the river is known as Mottlau.

A common theory for the etymology of the cities Gdańsk and Gdynia is that they are named after an older Polish and Kashubian name for the river, Gdania.