Flag Fen, east of Peterborough, England, is a Bronze Age site developed about 3500 years ago, comprising over 60,000 timbers, arranged in five very long rows, creating a wooden causeway across the wet fenland. Part way across the structure, a small island was formed. Items associated with it have led scholars to conclude the island was a site of religious ceremonies and significance. Archaeological work began in 1982 at the site, which is located 800 m east of Fengate. Flag Fen is now part of the Greater Fens Museum Partnership. A visitor centre has been constructed on site, and some areas have been reconstructed, including a typical Iron Age roundhouse dwelling.
A Neolithic trackway once ran across what archaeologists have termed as the "Flag Fen Basin", from a dry-land area known as Fengate, to a natural clay island called Northey . The basin is an embayment of low-lying land on the western margins of the Fens. The level of inundation by 1300 BC led the occupants to construct a timber causeway along the trackway route. The causeway, and centre platform, were formed by driving 'thousands of posts with long pencil-like tips' through the 'accumulating peaty muds' and into the firmer ground below. The resulting structure covered three and a half acres.
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