Offas Dyke (General)
http://www.offasdyke.demon.co.uk/dyke.htm
however and when ever it was created - there is very much an earth work, or perhaps collection of earth works i.e. man made rather than natural feature.
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Ἀριστοτέλης A Gloster & Hereford Boy in the Forest of Dean ><((((*>
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