In 2026, the Marathon des Sables (MDS) reaches a milestone: its 40th “Legendary” edition. What better way to celebrate four decades of desert ultra-endurance than by rewriting the record books? Among the announcements already stirring excitement: the “long day” stage for 2026 will be extended to 100 km, making it the longest single stage ever in MDS history. This bold move not only raises the bar for what runners will face, but signals that the 40th edition aims to become a defining moment of the race’s legacy.
A Brief History:
The roots of the Marathon des Sables reach back to the daring vision of French promoter Patrick Bauer. In 1984, he traversed part of the Sahara on his own, over 350 km in 12 days, with no external support, an experiment in isolation and survival. Two years later, in 1986, the first official Marathon des Sables was held, with 23 participants tackling a self-supported desert crossing. The winners, Bernard Gaudin and Christiane Plumere making history.
Over the years, MDS has grown from a niche extreme-race to one of the world’s most respected ultramarathons. Its signature format currently features around 250 km over 6-stages (7-days) in the Moroccan Sahara, with participants carrying their own supplies (food, sleeping gear, etc.) in full self-sufficiency – water and a place to sleep the only logistical supply. Terrain at The Legendary shifts from endless dunes, rocky plateaus, dried wadis, occasional mountains and shifting sands; daytime heat can often soar, while nighttime temperatures can drop sharply.
Notably, throughout its history, MDS Legendary has always included a stage that stretches well beyond the “single marathon” distance, 80–90 km is normal to test endurance in extremes. In 2009, there was a long-stage of 92km’s…. But a full 100 km in one go will top them all.
With a passing of time, MDS Legendary has also diversified; now offering shorter formats such as MDS 120 (70–120 km), the MDS Trek variant with lighter logistics, MDS RAID and for 2026, the MDS Ultra which for the first time offers a single-stage ultra of 100km’s or 100-miles to be undertaken with a 40-hour cut-off. But the heart of the MDS remains firmly with The Legendary stage race.
The 100 km “Long Day” and What It Means
MDS will feature a 100 km long day, a stage longer than anything ever attempted in MDS history. This is more than a symbolic gesture, it’s a structural change that forces participants to rethink pacing, supplies, strategy, and mindset. Will the 40th edition of MDS The Legendary be considered the hardest ever edition? With an expected total distance of 270km +/- the answer is yes!
From a participant perspective, there will be some key considerations.
- Pacing will be crucial with a delicate balance between enthusiasm and energy conservation. During the day, monitoring thermal stress will be crucial.
- Pack weight will be crucial – the 40th edition of MDS Legendary, now more than ever, will require participants to have the lightest possible pack without breaking the strict rules and regulations.
- Food – With a long day that is in real terms approximately 10 to 25% longer than usual, the need for extra calories and how those calories are consumed will become extra important.
- The mental toll will have a huge impact, that will start now with the announcement of a 100km stage – just as you prepare equipment and training, set time aside to prepare the mind for the challenge ahead. This new length will push athletes into deeper zones of fatigue, testing resilience, self-talk, and mental fortitude.
- Runners will traverse more varied landscapes, perhaps crossing more dunes, rocky flats, and most certainly everyone will require more night navigation.
- Announcing the 100 km day well in advance gives aspirants time to rework prep plans – use this time effectively.
Why 2026 Will Be a History-Making Edition
This is not just “another year” of MDS The Legendary, several factors are aligning to make the 40th edition uniquely compelling:
- Milestone Significance – Forty years is a symbolic turning point. And by choosing to mark it with the toughest-ever stage, the organisers are intentionally raising the narrative: “Legendary by name, Legendary by reputation.”
- New Records, New Legends – With no past precedent for a 100 km stage in MDS The Legendary, whoever finishes that leg (especially among the leaders) will enter the record books.
- Attracting Ambition – Some ultra runners chase the “most difficult” challenge. A 100 km desert stage is a headline that will draw audacious minds and bodies, possibly pushing the field performance upward.
- Legacy and Storytelling – In future retellings, the 2026 MDS The Legendary will be a pivotal point, some may say, the 40th edition was when MDS truly redefined itself. It’s the kind of turning point that historians of sport may hark back to.
- Amplifying the Extremes – MDS has always lived on the edge: heat, sand, navigation, resource management. By stretching one day to 100 km, the extremity is amplified. The race becomes less about surviving the day, and more about mastering it.
- The Longest Ever – With a long stage of 100km, the anticipated total distance for the 40th edition will be a record breaking 270km +/-.
Challenges & Risks to Keep in Mind
No radical shift comes without risks and MDS The Legendary are required to balance risk against challenge. A 100km stage has long been discussed for this iconic stage race, it’s only right that the 40th edition will personify the Legendary tag with a landmark distance. However, even the world’s top ultra runners may falter under a 100 km leg in desert conditions. Managing attrition will be critical. The required pace will be, as usual, 3.5km per-hour. And of course, the MDS blue and orange jackets will be on-hand, more than ever, to facilitate everyone crossing the line.
Some participants may feel disadvantaged if their prior prep or experience didn’t anticipate such a long stage, but, this is why this early announcement helps – fail to prepare, prepare to fail.
Perspective: How This Compares to Classic Ultra Benchmarks
To put 100 km in context: many stand-alone ultramarathons are in the 100 km to 100-mile range. But those are often supported events, with aid stations and crew support. In MDS The Legendary, with self-sufficiency, navigation demands, and desert extremes, layering a 100 km day is far harder than a flat 100k road ultra.
In prior MDS editions, long days of 80–90 km have already pushed runners to the brink, many cross the nights and run long into another day – for 2026, this will be the ‘norm’ for nearly all the participants.
The 40th edition becomes not just “another chapter,” but a rewriting of what MDS can be.
Final Thoughts: A Legendary Promise
The 2026 Marathon des Sables is setting the stage, literally and metaphorically for a landmark event. The 100 km long day announcement signals ambition, courage, and a willingness to push the narrative frontier of desert ultra-running. In addition, the implications for the overall race distance being 270k +/- adds to the drama.
For participants, 2026 will demand a rethinking of training philosophies, gear choices, pacing strategies, and mental frameworks. For the sport, it may become a reference point for what is “next level” in multi-stage desert ultras. And for storytelling, it offers rich stories:”
“Who conquered 100 km in the sands?”
“How 2026 changed MDS forever.”
Legendary by name, and with this edition, legendary by reputation in a whole new way.
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IAN CORLESS 