Beech Bottom Dyke

Beech Bottom Dyke is a massive Late Iron Age earthwork at the northern edge of St Albans, Hertfordshire, up to 30 m wide and 10 m deep, traceable for nearly 1.2 km. Constructed probably between 5 and 40 AD, it is attributed to the Catuvellauni tribe, likely built under King Cunobelinus to define territorial boundaries around their centre at Verlamion, predecessor of Roman Verulamium. The dyke formed part of a boundary system linking the settlements near St Albans and Wheathampstead, isolating high ground between the Rivers Ver and Lea. It is a Scheduled Ancient Monument.