From English Heritage, http://magic.defra.gov.uk/rsm/19055.pdf
The monument, which is divided into two areas of protection, includes Desborough Castle, a medieval ringwork popularly known as The Roundabout, an outer enclosure of earlier date and the probable remains of a round barrow.
Desborough Castle ringwork, believed to be the site of the castle at West Wycombe first mentioned in 1210-11, is situated at the north eastern end of a prominent spur overlooking the valley of the River Wye. The earthwork remains comprise a sub-rectangular enclosure, approximately 0.5ha in area, terraced into the hillslope to create a level flat interior. The defences include an outer ditch 2.6m deep around the upslope south west side, becoming shallower around the downslope north east side where it is reduced to an average depth of 1.6m. The inner rampart is similarly more massive around the south west, reaching a height from the ditch bottom of 3.6m, again becoming slighter around the north at only 2.9m. The interior slope of this rampart reaches 2.7m around the south and only 0.3m around the north..... The earthwork thus created is a large platform protected on its upper side by a strong rampart and open on its downhill side where it overlooks and dominates the Wye Valley.
Around the north and west sides of the castle site are the remains of a second earthwork comprising a spread rampart some 10m wide surviving mainly as a substantial outer scarp up to 1.5m high, the inner slope reduced to a slight ground rise 0.3m high. Around the north west corner for some 40m there are traces of a vestigial ditch 5m wide and 0.2m deep. The earthwork runs on a series of short straight sections, in an arc around the north of the main enclosure and at a distance of between 30m and 70m; the southern continuation is now lost in a housing estate.
Its form suggests that it is of an earlier date than the main ringwork enclosure and that it probably represents the remains of a slight univallate hillfort of a style belonging to the Late Bronze Age or Early Iron Age.
In addition to the two enclosures there is a third feature situated on the west side of the ringwork. The remains comprise a segment of a probably once circular mound which has been cut through by the construction of the ringwork ditch. Some 24m across and 0.7m high, it is believed to represent the surviving portion of a bowl barrow.
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