Saint-Pierre, La Reunion, Réunion Island, France · usually late October (date TBC)

100 mi

Diagonale des Fous

165 km Distance

9,600 m Climbing

10.0 Grit · Elite / extreme

21.3393° S, 55.4781° E © OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Climbing rate 58 m / km Mountain. Significant climbing. Steep sections will require power hiking.

terrain This is a mountain course. Poles are highly recommended for the sustained climbs.
gear With mountain terrain, choose a shoe with aggressive lugs (5mm+) for optimal performance.
nutrition For 100km+ efforts, prioritize real food at aid stations to prevent palate fatigue.

Chosen for 165 km of mountain with 9,600 m of ascent.

Trail Running Shoes 58 m of climb per kilometre — grip and rock protection before cushioning.
Race Nutrition Past 165 km the palate quits before the legs do — carry more than one flavour.
Hydration Vests Pole attachment and chest-strap stability on steep ground.
Trekking Poles 9,600 m of ascent to walk up.
Headlamps 165 km almost certainly means running into the night.