A bell barrow is a prehistoric burial site comprising between one and four earthen or stone mounds set within a ditched enclosure, the mounds being separated from the ditch by a berm. The mounds each usually cover one or more burials. The most common type, the single bell barrows range in size from 10m to over 60m across, the average being about 40m in overall diameter. The majority of bell barrows date to the Early Bronze Age.