Rugen, an island of Prussia, in the province of Pomerania, separated from the mainland by a channel from 1/2 to 2 m. wide; area, about 400 sq. m.; pop. of the circle of Rügen in 1867, 47,539. Numerous shallow bays and arms of the sea divide it into several peninsulas. The channel separating it from the mainland is gradually narrowing. (See Baltic Sea.) The surface presents great variety, and the scenery is very beautiful. The island is much visited in summer for sea bathing. The Stubbenkammer, a chalk headland in the north, rises about 440 ft. above the sea, its highest point, called the King's Seat, being the summit from which Charles XII. witnessed the sea fight between the Swedes and Danes, Aug. 8, 1715. There are many ancient sepulchral mounds on the island. Capital, Bergen. - Rügen was occupied in the 6th century by the Rugians, a Germanic people, and subsequently by Slavs, and in the early part of the middle ages was governed by princes of its own, but the Danes conquered it in 1168. The Swedes occupied it during the thirty years' war, and it was ceded to them at the peace of Westphalia, but it was allotted to Prussia in 1815. Several engagements took place off the island in 1864 between the Danes and the Prussians.