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 Vistula Lagoon is a brackish water lagoon on the Baltic Sea roughly 56 miles (90 km) long, 6 to 15 miles wide, and up to 17 feet (5 m) deep, separated from the Gdańsk Bay by the Vistula Spit.