The race route consists of a single 50 mile loop through the Chiltern Hills. Starting and finishing in the riverside village of Goring On Thames, It begins by heading down the 'hilliest' section of the Thames Path National Trail to Whitchurch, before joining the Chiltern Way on to Aid Station 1 at Tokers Green. The section through to Bix is gradually ascending but continues to be relatively fast running.
Upon leaving Bix, the next section around to Ibstone check point contains more of the elevation change and will be tougher going, though that is counteracted by the spectacular scenery. Runners head through Stonor park and pay a visit to Turville, climbing steeply out of the village directly past Cobstone Windmill.
After Ibstone check point which is roughly at the marathon mark, runners then continue on the Chiltern Way to the highest point on the course at Christmas Common (800ft), before a screaming fast descent underneath Watlington Hill, to join the Ridgeway as far as Swyncombe Farm aid station.
Runners then take athe Chiltern Way extension first east, then west to rejoin the Ridgeway at Nuffield. From there it's Grim's Ditch and the Ridgeway until the final aid station, where runners turn off and make their way on the final 9.1 miles to the finish back in Goring on Thames.
The route has 5,600 feet of climb, and 5,600 feet of descent.
A downloadable GPX / KML of the route is available by heading to the bottom of this page here.