The Isle of Portland is a tied island in the English Channel, 6 kilometers long by 2.7 kilometers wide, and is 5 miles south of Weymouth forming the southernmost point of the county of Dorset, England--it ends with the lighthouse at Portland Bill. A barrier beach called Chesil Beach also joins it to the mainland There are eight settlements on the Isle of Portland Fortuneswell, Castletown and Chiswell are the villages in Underhill, and Easton, Weston, Southwell, Wakeham and The Grove are on the Tophill plateau