Wikipedia
The Świna (; Pomeranian: Swina) is a river in Poland flowing from the Oder Lagoon to the Baltic Sea, between the islands of Uznam and Wolin. It is a part of the Oder River estuary, and carries about 75% of that river's waterflow (of the remainder, Peenestrom carries 15% and Dziwna 10%). It has a length of about 16 km. Świnoujście is a major town on the river.
The German Empire dammed and deepened the river from 1874-1880 to create the Kaiserfahrt ( Piast canal). It connects the northern part of the Świna directly with the Szczecin Lagoon and the Pomeranian harbor of Szczecin (Stettin). The river thus gained importance as a direct waterway to the industrial city. The territory along the river's path was transferred from Germany to Poland following World War II.