Ponter's Ball Dyke

Ponter's Ball Dyke is a linear earthwork located near Glastonbury in Somerset, England. It crosses, at right angles, an ancient road that continues on to the former island of dry land in the Somerset levels surrounding Glastonbury Tor. It consists of an embankment with a ditch on the east side. It is built across the ridge of land between Glastonbury and West Pennard. Both ends of the ditch and dyke disappear into moorland, formerly swamps.

The current visible remains extend to just over 1 kilometre. It is bisected by the A361 and crossed by three public footpaths. The gap where the road runs through the dyke is staggered, suggesting that the gap is original.