Ring ditch
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In archaeology, the term ring ditch refers to a regularly-shaped circular or pennanular ditch cut. The term is most often used as a generic description in cases where there is no clear evidence for the function of the site: for instance where it has been ploughed flat and is known only as a cropmark or a geophysical anomaly. The two commonest monument types represented by ring ditches are roundhouses (where the 'ditch' is actually a foundation slot or eaves drip gully) and round barrows. The term is not normally used for larger features than these, which would instead be described as 'circular enclosures'