Stonea Camp is an Iron Age hill fort located near March in the Cambridgeshire Fens. Situated on a gravel bank just 2 metres 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. The site exhibits at least two phases of development over several hundred years of settlement, with a D-shaped set of earth banks surrounded by a larger, more formal set of banks and ditches.

Roman control
The fort is a possible site of the battle of 47 AD mentioned by Tacitus, between the Iceni tribe and a Roman auxiliary force under governor Ostorius Scapula. Human remains have been found around the site including sword-marked adult bones and the cleaved skull of a child, indicating that the inhabitants were trapped and attacked within the settlement.
The remains of a multi-storey Roman tower have also been excavated within sight to the north of the Stonea Camp fortifications. The building was probably constructed to suppress further tribal rebellion or settlement at this site.