Challenge Event

Southern England / Thames Valley

Thames Valley

15.6, 25 or 31.3ml. 8 hours (25km) or 11 hours (40 and 50km)

08:00 (mass start for walkers (only) on the 50km route at 08:00 . Others may start between 08:15 and 09:30)

Start & finish is at Liston Hall (Marlow Community Association), Marlow, Bucks ,What3words : backyards.madder.scope

50km option to celebrate groups 50th anniversary. Another new route this year through the Chilterns, centred on the Hambleden & Stonor valleys, with a figure of eight centred on the pretty village of Hambleden & the long route extending to Bix

Runners should be mindful of checkpoint opening times (CP1 at 9 miles opens at 9.40am) & start at an appropriate time to their expected pace. All entrants to finish by 19:00. CP1 & a later route split will have cut off times included in the route description : if later than this, you will be diverted onto a shorter route. Limit of 150, normally reached in early Sept after opening to non-members on Sept 1st. Car parking for entrants is available nearby in the town’s c.p. One of these, in Liston Rd, is opposite the hall (and Lidl). There is another 100m away at Dean St. Both currently (as at Dec 2025) charge £1.20 per day on Sunday. No entries on the day, no refunds

Duncan Macgregor

£15 lDWA Members (entry from 1 June), all routes - £15.00. Non LDWA Members (entry from 1 Sept) , all routes - £20.00, includes e-certificate from SI and a free badge.