ALSEN, an island of Denmark, situated in the Lefser Belt, or entrance into the Baltic sea, between Slewick and Funen, 100 miles west of Copenhagen. It extends in length six leagues, and about two in breadth. The soil is fertile, producing abundance of fruit and variety of grain, with large crops of anilseeds, a carminative much used in seasoning the food and mixing with the bread all over the Danish dominions. E. Long. 10. 12. N. Lat. 55. 12.