Ancient relics of St. Albans: Beech Bottom Dyke

Beech Bottom Dyke is a large ditch running for almost a mile at the northern edge of St Albans, Hertfordshire, flanked by banks on both sides. It is up to 30 m (98 ft) wide, and 10 m (33 ft) deep. 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 Verulamium. Beech Bottom Dyke is thought to have originally been part of a defensive system. Other defences are the Devil's Dyke and another ancient earthwork known as 'The Slad'. These may have created a defensive earthwork running from the River Lea to the River Ver.

Sources: Wikipedia, OpenStreetMap, Wikidata