Circular earthwork enclosure bounded by a ditch and internal bank used as a ceremonial centre during the early 4th millennium bc across central and western Britain. The best‐known example is Stonehenge 1, Wiltshire. Within the flat interior space there are often burials, pits containing placed deposits, and arrangements of posts and standing stones. The main entrance usually opens towards the northeast, although smaller gaps in the earthwork open in other directions. These monuments appear to provide the inspiration for the design of classic henges through the middle and later 3rd millennium bc.