The Trundle is an Iron Age hillfort on St Roche's Hill about 4 miles (6 km) north of Chichester, West Sussex, England, built on the site of a causewayed enclosure, a form of early Neolithic earthwork found in northwestern Europe. Causewayed enclosures were built in England from shortly before 3700 BC until at least 3500 BC; they are characterized by the full or partial enclosure of an area with ditches that are interrupted by gaps, or causeways. Their purpose is not known; they may have been settlements, meeting places, or ritual sites. Hillforts were built as early as 1000 BC, in the Late Bronze Age, and continued to be built through the Iron Age until shortly before the Roman occupation.

Whitehawk Camp is the remains of a causewayed enclosure on Whitehawk Hill near Brighton, East Sussex, England. Causewayed enclosures are a form of early Neolithic earthwork that were built in England from shortly before 3700 BC until at least 3500 BC, characterized by the full or partial enclosure of an area with ditches that are interrupted by gaps, or causeways. Their purpose is not known; they may have been settlements, or meeting places, or ritual sites. The Whitehawk site consists of four roughly concentric circular ditches, with banks of earth along the interior of the ditches evident in some places. There may have been a timber palisade on top of the banks. Outside the outermost circuit there are at least two more ditches, one of which is thought from radiocarbon evidence to date to the Bronze Age, about two thousand years after the earliest dated activity at the site.