The Sweet Track is an ancient causeway in the Somerset Levels, England . It was built in 3807 BC and is the second -oldest timber trackway discovered in the British Isles, dating to the Neolithic. It is now known that the Sweet Track was predominantly built over the course of an earlier structure , the Post Track.
The track extended across the now largely drained marsh between what was then an island at Westhay and a ridge of high ground at Shapwick, a distance close to 2,000 metres (6,600 ft) or around 1.2 miles. The track is one of a network that once crossed the Somerset Levels. Various artifacts and prehistoric finds, including a jadeitite ceremonial axe head , have been found in the peat bogs along its length .
Construction was of crossed wooden poles , driven into the waterlogged soil to support a walkway that consisted mainly of planks of oak , laid end-to-end. The track was used for a period of only around ten years and was then abandoned, probably due to rising water levels. Following its discovery in 1970, most of the track has been left in its original location, with active conservation measures taken, including a water pumping and distribution system to maintain the wood in its damp condition. Some of the track is stored at the British Museum and at the Museum of Somerset in Taunton.