Stralsund (28), a fortified seaport of North Prussia, on Strela Sound, opposite the island of Rügen, in the Baltic, and 66 m. NW. of Stettin, forms of itself an islet, and is connected with the mainland (Pomerania) by bridges; is a quaint old town, dating back to the 13th century; figures often in the wars of Prussia, and is now a place of considerable commercial importance.