Wolin (Pomeranian Wòlin, German: Wollin) is the name both of an island in the Baltic Sea, just off the Polish coast, and a town on that island. It is separated from the island of Usedom by the Świna river, and from mainland Pomerania by the Dziwna river. The origins of the name are unknown, although it is likely of Slavic origin. In the old Slavic language the word "wolyn" meant a wetland, and over time, it was Germanised.