The event, which is organised by Swindon Council, includes a Multi-terrain race and Fun Run.
The three forts in question are the magnificent iron age hilltop camps of Cissbury, Chanctonbury Ring and Devil’s Dyke on the South Downs
The marathon runs along a historic route through the Wiltshire and Hampshire countryside – the Clarendon Way
Combines beauty and a beast of a climb.
The White Peak Marathon and Half Marathon are run on compacted limestone and cinder surfaces on former railway tracks making it akin to road running.