Linear_earthwork
In archaeology, a linear earthwork is a long bank of earth, sometimes with a ditch alongside. There may also be a palisade along the top of the bank. Linear earthworks may have a ditch alongside which provides the source of earth for the bank and an extra obstacle. There may be a single ditch, a ditch on both sides or no ditch at all. Earthworks range in length from a few tens of metres to more than 80 km. Linear earthworks are also known as dykes (also spelt dike), or "ranch boundaries".
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