Deil's Dyke
Deil's Dyke, Pict's Dyke or Celt's Dyke in south-west lowland Scotland is a linear earthwork that roughly follows the contours that divide upland pasture from lowland arable land, effectively acting like the head-dykes of medieval and later times although its true purpose has not been settled. The Deil's Dyke, sometimes written as 'dike', is formed from an earthen berm of rounded form that varies from 2.0 to 4.0 m (6.6 to 13.1 ft) wide and a maximum of 0.7 m (2.3 ft) high, sometimes having a stone core.