At 515 m, Ryder's Hill is one of the highest points on the southern part of Dartmoor, Devon, England. On its summit there are two standing stones and a low cairn, on top of which is a triangulation pillar.
One of the standing stones is called Petre's Bound Stone and it marks the boundary of three civil parishes: Dartmoor Forest, Holne and Buckfastleigh. The cairn, which is not very prominent, has an important history. It was one of the boundary markers of the Forest of Dartmoor mentioned in the Perambulation of 1240 and has been known as "Knattleborough" (or variations of that name) since at least the 17th century.
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