Iron Age sites in the Quantocks include major hill forts at Dowsborough and Ruborough, as well as several smaller earthwork enclosures, such as Trendle Ring and Plainsfield Camp. Ruborough near Broomfield is on an easterly spur from the main Quantock ridge, with steep natural slopes to the north and south east. The fort is triangular in shape, with a single rampart and ditch (univallate), enclosing . A linear outer work about away, parallel to the westerly rampart, encloses another . The name "Ruborough" comes from "Rugan beorh" or "Ruwan-beorge" meaning "Rough Hill". The Dowsborough fort has an oval shape, with a single rampart and ditch ("univallate") following the contours of the hill top, enclosing an area of . The main entrance is to the east, towards Nether Stowey, with a simpler opening to the north west, aligned with a ridgeway leading down to Holford. A col to the south connects the hill to the main Stowey ridge, where a linear earthwork known as Dead Woman's Ditch cuts across the spur.