Cross-ridge dykes, thought to date to the early medieval period, are rare features in southeast Wales, typically surviving as short banks or earthworks across upland ridges. This Cadw-funded survey examined 23 recorded sites, confirming 16 as genuine monuments, most already protected as Scheduled Ancient Monuments. Fieldwork assessed their condition, including excavation at Bedd Eiddil, which revealed construction on Bronze Age soils. The study highlighted ongoing threats such as vehicle damage and fly-tipping, emphasising the need for continued protection and management of these uncommon and vulnerable monuments.
