The Devil's Dyke is an important archaeological monument and wildlife site.

•Linear defensive bank and ditch 12km long
•Runs from Reach to Woodditton across chalky soils

•Finest surviving Anglo-Saxon earthwork 10m high in places
•Notable for its wildflowers, butterflies and grassland insects
•In 2002 a partnership project began to restore the dyke’s habitats
•Archaeological Monument (SAM) and Site of Special Scientific Interest (SSSI)
•Shrub-covered, chalk grassland and wooded sections
•Steep south-facing chalky slopes ideal for rare chalkland plants

Notable wildlife includes:
•Skylark, Whitethroat and Yellowhammer
•Common Blue, Chalkhill Blue, Brown Argus and Brimstone
•Pasque Flower, Lizard Orchid and Chalk Fragrant Orchid
 

"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

http://www.british-history.ac.uk/rchme/cambs/vol2/pp139-147

"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."

"Devil’s Dyke is an Anglo-Saxon earthwork in Cambridgeshire that runs approximately seven-and-a-half miles from the village of Reach on the edge of the fens to Woodditton at it’s south-easterly end. It is not only a Scheduled Ancient Monument (SAM) but also a Site of Special Scientific Interest (SSSI) due to the internationally important areas of chalk grassland that make up much of its slopes."