Wolin (German: Wollin, Pomeranian Wòlin) is the name both of a Polish island in the Baltic Sea, just off the Polish coast, and a town on that island. Administratively the island belongs to the West Pomeranian Voivodeship. Wolin is separated from the island of Usedom (Uznam) by the Świna river, and from mainland Pomerania by the Dziwna river. The island has an area of 265 km2 (102 sq mi) and its highest point is Mount Grzywacz at 116 m above sea level
Water from the river Odra (German: Oder) flows into the Szczecin Lagoon and from there through the Peene west of Usedom, Świna and Dziwna into the Bay of Pomerania in the Baltic Sea.
Most of the island consists of forests and postglacial hills. In the middle is the Wolin National Park. The island is a main tourist attraction of northwestern Poland, and it is crossed by several specially marked tourist trails, such as 73-kilometer long trail from Międzyzdroje to Dziwnówek. There is a main, electrified rail line, which connects Szczecin and Świnoujście, plus the international road E65 (national road 3 / S3 expressway) crosses the island.