The Motlawa reference article from the English Wikipedia on 24-Jul-2004
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Motlawa

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Sluza Kamienna - Gdansk Dolne Miasto
Gdansk Glowne Miasto
The Motława river is a river in Eastern Pomerania. The source is in Szpegawskie lake, north-east from Starogard Gdanski. It goes through Rokickie lake, and goes to Leniwka. Length 64.7 km, drwn area 1511.3 km2.

The city of Gdansk is situated at its mouth in the Leniwka.

The Polish language name Motława is derived from the Old Prussian language. In German language the river is known as Mottlau.

An older Polish, or Kashubian, name of the river is Gdania, from which the name of the cities Gdynia and Gdansk are derived.