"The Devil's Dyke, is a massive linear defensive earthwork 7½ miles long running N.W.-S.E. comprising a large bank with a deep ditch on its S.W. side. It extends from the edge of the fens at the village of Reach to the upland area of south-east Cambridgeshire near Wood Ditton. It lies almost entirely upon chalk which slopes generally N.W. between 350 ft. and 10 ft. above O.D. Apart from a number of gaps for roads and railways and the destruction of its extreme N.W. end, it is in good condition."
From British History Online
"A 7.5 mile long Anglo-Saxon earthwork consisting of a bank and ditch built out of clay and chalk near Newmarket. The Dyke is notable for its wildflowers - including several species of orchid - and butterflies. In 2002 a partnership project began to restore the dyke involving Natural England, English Heritage, the Wildlife Trust for Beds, Cambs and Northants and Cambridgeshire County Council's Countryside, Archaeological and Farms Units, working with landowners and managers and local residents.”
From The Wildlife Trusts
"Set in the heart of rural Cambridgeshire, Devil’s Dyke is often described as Britain’s finest Anglo-Saxon earthwork of its kind – and it’s certainly one of the best surviving.
The ancient monument stretches for seven and a half miles, and reaches a daunting 10m (33ft) in height. This archaeological treasure is also a Site of Special Scientific Interest (SSSI) as it is a haven for wildflowers, butterflies and a range of grassland insects come spring and summer."