This drawing covers the coast of Weymouth Bay and the Isle of Portland. Lighthouses are marked on the tip of the island. Red lines denote stone walls. Sandsfoot Castle and Portland Castle are shown by blocks of red ink. These were among of a series of castles built by Henry VIII as defence against Spain and France after his divorce from the Catholic Catherine of Aragon and his breaking of ties with Rome. Chalbury Hillfort is indicated above Weymouth Bay. Archaeological sites were of interest to many of the draughtsmen and were often included even before it became obligatory to do so in 1816. The boundary with Purbeck is indicated by a red pecked line.