Course identity

The Diagonale des Fous starts in Saint-Pierre in southern Réunion, crosses the island’s ridges and cirques and finishes in Saint-Denis in the north, officially about 180 km. This page pins the 2026-diagonale-des-fous-official-course version using the organiser's public material from Grand Raid de La Réunion.

This is a night-start tropical-island ultra where distance and climb are only the entrance; weather windows, aid spacing and private-land rules must be read in the official material. Do not scout restricted sections without permission.

Verified facts

• It starts in Saint-Pierre in the south and finishes in Saint-Denis in the north, crossing Réunion point-to-point.
• The official distance is about 180 km with about 10,200 m of climb; the route crosses the Pitons, Cirques and Remparts national park.
• The organiser prohibits scouting on some private-land sections and publishes no redistributable GPX; this site provides only an anchor and official link.
• Distance basis: Official about 180 km.
• Elevation basis: Official climb about 10,200 m
• The map anchor is a RunMap editorial overview location, not an official start, finish or course coordinate.

What this page does not provide

This site has no redistributable course track; where the organiser publishes a map, the official page remains the final authority. It does not treat a third-party track, illustration or elevation sketch as official geometry; race-day routes can also change because of construction, weather or safety arrangements.

How to use this page

Treat it as a pinned-version entry, not a navigation tool. Confirm the year, category and direction, then check the organiser's technical material for that edition. Use the pace calculator for arithmetic and read the marathon distance for training context. Ultra and trail races also require separate checks of mandatory kit, aid spacing, weather windows and escape options.

Sources and reuse

This original explanatory text was prepared by the RunMap editorial desk from Grand Raid de La Réunion's public material and is licensed CC BY 4.0. Event names, official marks, official route text and official files remain the property of the organiser; This site has no redistributable course track; where the organiser publishes a map, the official page remains the final authority.