The village of Sharnbrook is situated in the historic county of Bedfordshire 11km north of the county town of Bedford, 24km east of Northampton and 14km southeast of Wellingborough, centred on SP 99093 59600.
The earthwork in Castle Close, Sharnbrook (Beds HER 994) is described in the Historic Environment Record (HER) for Bedfordshire as ‘an oval banked & ditched enclosure, medieval in date’. It is a Scheduled Ancient Monument (SAM 20404), described in the schedule notes as a moated site.The monument has a slightly oval form, measuring about 60m across. It is defined by a ditch approximately 7m wide by up to 3m deep, inside which is a 1.5m high bank and a central island. A small area of flat ground in the middle of the island measures approx 25m by 20m. There are no causeways across the moat. The eastern side of the ditch is fed by seepage, holds standing water at certain times of the year and is drained by a leat or stream, 4m wide and 0.5m deep, which runs for approx 100m to the east where it joins other field drains. Today, the monument is accessed via a path that approaches from Lodge Road through a small copse of woodland comprising the Castle Close Wildlife and Heritage Site.
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