Stonea Camp is an Iron Age hill fort located at Stonea near March in the Cambridgeshire Fens. Situated on a gravel bank just 2 metres (6 ft 7 in) above sea-level, it is the lowest hill fort in Britain. Around 500 BC, when fortification is thought to have begun at this site, this "hill" would have provided a significant area of habitable land amidst the flooded marshes of the fens.