Chiswell, rarely Chesilton, is a small fishing village at the southern end of Chesil Beach on the Isle of Portland in Dorset, and is the oldest settlement on the island. The small bay at Chiswell is called Chesil Cove, which the village is built around. The promenade and sea wall which forms Chiswell's coastal defences are a prominent feature.
The village itself is almost indistinguishable from Fortuneswell, the largest village on the island, as the two settlements are very close. However this distinction can be made: Chiswell occupies flat land close to sea level, whereas Fortuneswell's streets wind up and down the steep hills.
However, A Vision of Britain through Time provides a map of this part of the Isle of Portland and this short description from John Marius Wilson's Imperial Gazetteer of England and Wales of 1870-72: