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Geoglyph
motif produced on the ground; observed only remotely or from space / From Wikipedia, the free encyclopedia
A geoglyph is a large-scale man-made feature on the ground. Usually longer than 4 metres, it is made by placing rocks, stones, live trees, gravel, or earth.
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A positive geoglyph is formed by the arrangement and alignment of materials on the ground, while a negative geoglyph is formed by removing material to expose bare ground.