Bokerley Dyke

Bokerley Dyke is a linear earthwork stretching 5.75 kilometres across Cranborne Chase in Dorset, partly tracing the county border with Hampshire. It runs between Woodyates and Martin and belongs to a Scheduled Monument that also includes Grim’s Ditch and other earthworks. The site sits on open chalk downland where Martin and Tidpit Downs form a Site of Special Scientific Interest nearby. Augustus Pitt Rivers excavated parts of the dyke between 1888 and 1891, followed by Philip Rahtz in 1958 before road widening. Evidence suggests it began in the Bronze or Early Iron Age as a boundary marking political and cultural divisions. The dyke was cut through by Ackling Dyke, a Roman road built in the 1st century between Old Sarum and Badbury Rings. In the 4th century the dyke was reshaped and the Roman road blocked, with a coin of Valens dated after 364 AD marking this change. Roman sources describe attacks on Britain by Picts, Scots and Saxons during the supposed Great Conspiracy of 367–368 AD, which may explain why the dyke was restored. After the road reopened, the dyke remained in use and still marks the county boundary today. Visitors walk along the grassy bank and ditch that run continuously for several kilometres across open downland. The route passes through Martin and Tidpit Downs, where chalk grassland supports rare plants and insects. Sections align with Grim’s Ditch, creating a linked network of ancient earthworks to explore. The wide views stretch across rolling hills and distant woodland edges. The earthwork’s long history is visible in its layered banks and the gaps where Roman engineers once forced a passage.