a seaport of Denmark, in the amt (county) of the island of Zealand, 69 m. by rail W.S.W. of Copenhagen, on the east shore of the Great Belt. Pop. (1901), 60J4. The harbour, which is formed by a bay of the Baltic, has a depth throughout of 20 ft. It is the point of departure and arrival of the steam ferry to Nyborg on Fiinen, lying on the Hamburg, Schleswig, Fredericia and Copenhagen route. There is also regular communication by water with Kiel. The chief exports are fish, cereals, bacon; imports, petroleum and coal. A market town since the 14th century, Korsor has ruins of an old fortified castle, on the south side of the channel, dating from the 14th and 17th centuries.