The Pasłęka is a river in northern Poland that debouches into the Baltic Sea on the Vistula Lagoon near Braniewo. It flows through the Olsztyn and Mrągowo lakelands, and through Gdańsk Coastal Area. The reported length of the river varies, depending on sources, from 169 to 211 km. The river springs nearby Olsztynek, between Stawiguda and Gryźliny, at 156.6 m AMSL; though some sources place it in the Pasłęk reservoir, which lies at 153 m AMSL. The river flows through the town of Braniewo. The drainage area of Pasłęka spreads over 2,330 km2. Pasłęka's average mouth discharge equals 15.7 m3/s. The whole length of the river is covered by River Pasłęka Beaver Refugium nature reserve. Pasłęka is one of Warmia's two main rivers, accompanied by Łyna. Pasłęka divides two historical lands: Warmia and Upper Prussia (Powiśle), consequently for centuries bordering Polish Warmia and the Polish fiefdoms of the Teutonic Order and Ducal Prussia. In the 2007 water quality survey conducted on Pasłęka 2 kilometers (1.2 mi) from its mouth, its water was classified as the 4th class. '' The historic Polish name Pasłęka was officially confirmed following World War II in 1949, replacing the former German name Passarge.

Infrastructure

Pasłęka is sailable between its mouth in Nowa Pasłęka and the hydro plant in Braniewo. Several hydro plants are built on the river:

Tributaries

Pasłęka crosses the following lakes: Wymój, Sarąg, Łęguty, Isąg.