LDWA Thames Valley Marlow Donkey
A new Chilterns route each year from Marlow, centred on the Hambleden and Stonor valleys: 25k, 40k or a fiftieth-anniversary 50k. Limited to 150 and usually full by early September.
| Distance | Ascent | Per km |
|---|---|---|
| 50K | — | — |
| 40K | — | — |
| 25K | — | — |
Nobody has reviewed this one yet
No reviews of the Marlow Donkey, and nothing on what people wore. Both are things no organiser publishes and every runner wants before they enter — how it actually went, and what was on your feet.
Ran it? Write the first reviewRunning it soon? Connect Strava and we will ask you about it the day you finish, so you do not have to remember to come back.
Pick your distance
11h cut-off, which needs 13:12/km
What you’re in for
A new Chilterns route each year from Marlow, centred on the Hambleden and Stonor valleys: 25k, 40k, or a fiftieth-anniversary 50k. Eight hours for the 25k and eleven for the longer two, all back by seven. Limited to 150 and usually full by early September. An LDWA challenge event, which means walkers and runners together, a route description to navigate by rather than tape, checkpoints with food and drink, and a meal at the end. Entry is through the LDWA's own system, places are limited, and the ones in this list tend to fill early.
Terrain and trail
Chalk bridleway, beech-wood single-track and the steep sides of the Chiltern dry valleys — firm in October, greasy under leaves after rain. A trail shoe.
Partner · affiliate policy
Cut-offs
8 hours for the 25k, 11 hours for the 40k and 50k. All to finish by 19:00.
How to enter
Sun, 4 Oct 2026 · Entries open · £15–£20
Enter on their website ↗Entries are handled by SiEntries, not by us. We take nothing for sending you there.
Add to your calendar · with the start time
Common questions
- The Marlow Donkey offers 3 distances: 50K (31.1 miles), 40K (24.9 miles), 25K (15.5 miles).