A reave is a long and generally straight boundary wall made of stone that was built during the Bronze Age. Reaves were identified as prehistoric features on Dartmoor in Devon, England in 1972, and although they had been described by

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s in the 1820s, the knowledge of their origins had been lost, ignored and misrepresented for around 150 years. There are three main classes of reaves: parallel reaves divided land to create rectilinear fields which were sometimes subdivided by cross reaves. Terminal reaves tend to run for great distances along

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or watersheds and served to divide the enclosed areas from the higher open moor. In total, the reaves on Dartmoor cover an area of over . There are over 20 major field systems delineated by reaves on Dartmoor. The largest is around Rippon Tor, which covers over . Other large systems are North Dart (over ), South Dart () and Easdon Down (). The longest reave identified on Dartmoor is known as the Great Western Reave, which, although incomplete, stretches over from beyond White Tor in the north, over Roos Tor, through the Merrivale archaeological landscape and Foggintor granite quarries to its southern end, east of Sharpitor, by the side of the B3212 road.Fleming 1988, pp.42–44

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