Thorne Island is a rocky islet and part of the community of Angle, Pembrokeshire, Wales, with an area of 2 acres (8,100 m2), dominated by a coastal artillery fort built to defend the Milford Haven Waterway in the mid-19th century. It has been the site of a number of shipwrecks, including one in 1894 that was carrying a cargo of Scotch whisky.

Dale Fort is a mid-19th-century coastal artillery fort at Dale Head, a rocky promontory near Dale, Pembrokeshire, west of Milford Haven in Wales. It is one of the centres run by Field Studies Council and offers residential and non-residential fieldwork for schools, colleges and universities, holiday accommodation and professional and leisure courses in natural history and arts.