The Largest Henge

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Both Marden and Durrington Walls are claimed to be the largest henge on a well known online encyclopedia. So I quickly snapped them from Google Earth (hopefully all at the same scale)

Measuring them using the tools on www.magic.gov.uk I make Marden 13.6 ha and Durrington Walls 15.5 ha. These are only rough measurements as it is not easy to see on the map the exact outlines of the henges.