During the 7th millennium BC the sea level rose and flooded the valleys and low-lying ground surrounding Glastonbury so the Mesolithic people occupied seasonal camps on the higher ground, indicated by scatters of flints. The Neolithic people continued to exploit the reedswamps for their natural resources and started to construct wooden trackways. These included the Sweet Track, west of Glastonbury, which is one of the oldest engineered roads known and was the oldest timber trackway discovered in Northern Europe, until the 2009 discovery of a 6,000-year-old trackway in Belmarsh Prison. Tree-ring dating (dendrochronology) of the timbers has enabled very precise dating of the track, showing it was built in 3807 or 3806 BC. It has been claimed to be the oldest road in the world. https://en.wikipedia.org/wiki/Glastonbury#Prehistory