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Quick Summary: The Marathon des Sables (MdS) is a six-stage, 250 km (155-mile) ultra-marathon held every year in the Moroccan Sahara Desert. It is widely known as the world’s toughest footrace, with temperatures reaching up to 50ยฐC (122ยฐF). Competitors carry all their food and gear in a backpack for the entire race week, only water and a basic tent are provided.
For Marathon des Sables 2026, the race is expected to take place in April in the Merzouga region of southern Morocco, the same iconic desert landscape that Desert Merzouga Tours knows better than anyone.
What Is the Marathon des Sables?
The Marathon des Sables, French for “Marathon of the Sands”, is a multi-stage ultra-marathon across the Sahara Desert in Morocco. It was created in 1986 by Patrick Bauer, a Frenchman who walked 350 km alone through the desert as a personal challenge. Since then, it has grown into one of the most famous endurance races on earth, attracting around 1,000โ1,300 runners from more than 60 countries each year.
The race covers approximately 250 km over six stages in about seven days. What makes it truly extreme is the self-sufficiency rule: every runner must carry their own backpack containing all food, a sleeping bag, and survival equipment for the full race. The organisation only provides water at checkpoints and a basic Berber tent shared with seven other runners at the end of each stage. There are no hotels, no restaurants, and no support crews allowed.
The MdS earns its reputation as the world’s toughest footrace not just because of the distance, but because of the combination of extreme heat, self-sufficiency, sand dunes, rocky terrain, and back-to-back daily stages with very little recovery time.
A Brief History
Over nearly four decades, the race route has changed every year while keeping the same 250 km distance. Runners have crossed salt flats, towering sand dunes in the Erg Chebbi and Erg Chigaga, rocky hamada plateaus, and dry riverbeds. The race has become a global bucket-list event with waiting lists that sometimes stretch 12โ18 months ahead.
The Cost of Entering Marathon des Sables 2026
One of the first questions every potential entrant asks is: how much does the Marathon des Sables cost? The answer depends on where you live, when you register, and how much you spend on kit. Below is a full breakdown based on 2025 pricing. Expect slight increases when official 2026 fees are announced on the MdS website.
| Item | Estimated Cost (โฌ) | Notes |
|---|---|---|
| Race Entry Fee | โฌ3,400 โ โฌ3,800 | Varies by nationality and registration date |
| Flights to Morocco (return) | โฌ300 โ โฌ900 | From Europe; higher from USA or Asia |
| Coach Transfer (airport to bivouac) | โฌ200 โ โฌ400 | Organised by race or privately arranged |
| Mandatory Kit (pack, sleeping bag, etc.) | โฌ400 โ โฌ800 | Higher for first-timers buying everything new |
| Specialist Footwear and Gaiters | โฌ150 โ โฌ300 | The most important kit purchase |
| 7-Day Food Supply | โฌ150 โ โฌ350 | Freeze-dried meals or custom food packs |
| Pre-Race Training Camps (optional) | โฌ400 โ โฌ1,200 | Heat acclimatisation camps in Morocco or Spain |
| Travel Insurance | โฌ80 โ โฌ200 | Must specifically cover ultra-endurance racing |
| Estimated Total | โฌ5,000 โ โฌ8,000+ | Budget more if buying premium kit |
Tip: Register as early as possible. The Marathon des Sables regularly sells out 12โ18 months in advance. Check the official MdS website for the 2026 registration window.
Important Rule Changes for 2025โ2026
The MdS organisation updated several rules in recent editions. These are the key changes you need to know before purchasing kit or planning your race strategy:
- The minimum pack weight requirement has been removed. The old 6.5 kg minimum has been replaced with a minimum of 2,000 kcal of food per day. This means you can go lighter โ but you must carry enough fuel.
- A GPS tracker is now mandatory. The race-issued tracker must be carried at all times. It is included in your race pack.
- Water checkpoints are now spaced no more than 12 km apart, following updated medical safety guidance from the race doctors.
- Personal camera drones are banned within the race corridor for safety and privacy reasons.
Always check the latest official rulebook on the MdS website before making any kit purchases, as rules can change between editions.
The Ultimate Marathon des Sables Kit List
Getting your kit right is one of the most important parts of your MdS preparation. Your goal is to carry everything you need to survive and race for seven days while keeping your pack as light as possible. Most experienced runners aim for a total pack weight of 8โ10 kg at the start of the race. As you eat through your food supply, the weight drops significantly.
Mandatory Kit (You Will Be Checked at Start)
The race organisation checks every runner’s kit before the start. If you are missing any mandatory item, you will be disqualified or given a time penalty. Here is what you must carry:
- Backpack with a minimum capacity of 20 litres
- Food for the entire race โ minimum 2,000 kcal per day
- Sleeping bag suitable for temperatures down to at least 5ยฐC
- Compass (topographic map is provided by the race)
- Distress signal flare (only to be used in genuine emergencies)
- Anti-venom pump (for scorpion and snake bites)
- 10 safety pins
- Head torch with spare batteries (essential for the long night stage)
- Emergency survival blanket
- Sunscreen with a minimum SPF of 30
Footwear: The Most Critical Decision
More runners drop out of the Sahara Desert race due to foot problems than any other cause. Blisters, black toenails, and nerve damage are common when shoes are wrong. Follow these rules:
- Go half a size up from your normal running shoe. Feet swell significantly in extreme heat โ sometimes by a full shoe size over a long stage.
- Choose a wide toe box. Narrow race shoes cause serious damage over multiple days. Good options include the Altra Lone Peak 7, Hoka Speedgoat 5, and Salomon Sense Ride 5.
- Attach sand gaiters before the race. Marathon des Sables gaiters are specialised sand shields sewn directly onto the shoe collar to prevent fine desert sand from entering the shoe. Have them professionally stitched on by a cobbler 3โ4 months before the race using your shoe brand’s gaiter system.
- Train 200+ km in your exact race shoes before arriving in Morocco. Do not wear new shoes at the start line.
Nutrition Strategy: What to Eat During the Race
The most common nutrition mistake in the MdS is not eating enough because runners are focused on keeping pack weight low. This is a dangerous error. The mathematics are simple: fewer calories means slower running, which means more time exposed to the sun, which means higher risk of heat exhaustion and medical withdrawal.
How Many Calories Do You Need Per Day?
| Calorie Level | Daily Total | What It Means | Approx. Food Weight |
|---|---|---|---|
| Survival minimum | 2,000โ2,500 kcal | You will finish but with significant muscle loss and energy crashes by Day 4 | ~900 g โ 1.1 kg per day |
| Recommended | 2,500โ3,000 kcal | Good balance of fuel and pack weight for most runners | ~1.1 kg โ 1.3 kg per day |
| Optimal performance | 3,000โ3,500 kcal | Best for competitive runners; preserves muscle mass and mental clarity | ~1.3 kg โ 1.5 kg per day |
To maximise calories while minimising weight, aim for foods that deliver at least 500 kcal per 100 g. Good choices include freeze-dried meals (400โ500 kcal/100 g), nut butters (600 kcal/100 g), dark chocolate (540 kcal/100 g), and olive oil sachets (884 kcal/100 g).
Electrolytes and Sodium: The Science
Sweating in extreme heat causes serious sodium loss. Drinking plain water without replacing sodium leads to hyponatraemia โ dangerously low blood sodium โ which can be fatal. Every water ration in the MdS must be consumed with an electrolyte tablet.
| Activity Level | Sodium Target per Litre of Water | Recommended Source |
|---|---|---|
| Resting or walking | 500โ700 mg per litre | Standard electrolyte tablets |
| Running at race pace | 700โ1,000 mg per litre | High-sodium tabs plus salty snacks |
| Long stage (90 km+ overnight) | 1,000โ1,200 mg per litre | Precision Hydration PH1500 or SOS Hydration |
Marathon des Sables Training Plan and Heat Acclimation
A good Marathon des Sables training plan has three pillars: building weekly mileage, developing strength and durability, and adapting your body to extreme heat. Below is a simple six-month framework. Adjust it based on your current fitness level.
6-Month Training Framework
| Month | Focus | Weekly Mileage | Key Activities |
|---|---|---|---|
| Month 1 | Base Building | 50โ60 km | Easy aerobic runs; start back-to-back long runs on weekends; begin strength training (glutes, hips, calves) |
| Month 2 | Mileage + Pack Carry | 60โ80 km | Begin training with your race pack (start at 4 kg, add 0.5 kg weekly); introduce weekly trail runs |
| Month 3 | Volume Peak | 80โ100 km | Two consecutive long runs with pack at race weight; start foot care routine (taping, skin conditioning) |
| Month 4 | Heat Adaptation Begins | 70โ90 km | Start sauna protocol; if possible, visit Morocco for a desert training trip; rehearse full nutrition plan |
| Month 5 | Race Simulation | 60โ80 km | Complete a 3-day simulation in full race kit; test all food; practise camp setup and sleep routine |
| Month 6 | Taper and Final Prep | 30โ50 km | Reduce volume to 50โ60% of peak; maintain short quality sessions; final kit check; arrive in Morocco 3 days early |
The Sauna Heat Acclimation Protocol
Scientific research confirms that 10โ14 days of deliberate heat exposure increases blood plasma volume, lowers your heart rate during exercise in the heat, and improves the efficiency of your sweating. This is the most effective single preparation tool available to MdS runners who train in cold or temperate climates.
Here is the exact protocol used by experienced MdS finishers. Begin this 3โ4 weeks before the race:
- Use a dry sauna set to 80โ90ยฐC. Start with sessions of 20 minutes and add 5 minutes per session up to a maximum of 40 minutes.
- Do your sauna session immediately after a run, while your body temperature is already elevated. This increases the adaptation effect.
- Drink 500โ750 ml of electrolyte fluid during each session to replace what you sweat out.
- After the session, do not use a cold shower or ice bath โ this reverses the heat adaptation. Cool down naturally and rehydrate with a sodium-rich drink.
- Wear your race kit during sauna sessions to test for chafing and seam irritation in heat conditions.
- Stop the protocol 5โ7 days before race day to allow full recovery while keeping the adaptation benefits.
By day 10 of this protocol, you should notice your resting heart rate in the heat is 10โ15 beats per minute lower than it was on day one. That is your body adapting to function in hot conditions.
The Bivouac Reality: Sleep, Recovery, and the Mental Challenge
Most MdS guides focus entirely on the running. But what happens between the stages, in the bivouac camp, is just as important for finishing the race. This is where experienced runners gain an edge, and where unprepared runners fall apart.
What to Expect at Night in the Bivouac
The bivouac is an open-sided Berber tent shared with seven other runners. It offers shelter from wind and cold but very little privacy or noise reduction. Expect 5โ6 hours of broken sleep per night. Your tent-mates will be treating blisters, cooking food, repacking bags, and often snoring. Ear plugs are considered essential kit by almost every experienced finisher.
The temperature in the Sahara drops sharply after sunset โ from 45ยฐC during the day to as low as 10ยฐC at night. Get into your sleeping bag as soon as you have eaten and treated your feet. Elevate your legs slightly using your pack to help reduce overnight swelling.
Foot Care at Camp
After every stage, visit the medical tent before doing anything else. The MdS employs a large team of volunteer doctors and nurses who specialise in desert race medicine. They provide free blister treatment including draining, cleaning with iodine, and surgical lancing of severe blisters. Using this service every day of the race is one of the most important habits for completing the full distance.
The Mental Side of the Race
The Marathon des Sables is, at its core, a mental event. Your physical training carries you to the start line. Your mindset carries you to the finish. These three approaches consistently help runners get through the darkest moments of the race:
- Think checkpoint to checkpoint, not kilometre to kilometre. Never focus on the total remaining distance. Just run to the next water point, which is usually 8โ12 km away. Then do it again.
- Know your reason for being there before you arrive. When things become very difficult at kilometre 180, you need a motivating reason that is stronger than your discomfort. Write it somewhere visible before each stage.
- Use the tent community. By Day 3, your seven tent-mates become an important source of support, humour, and perspective. The MdS creates some of the strongest friendships in sport. Lean on each other.
Local Knowledge: Desert Merzouga Tours offers guided treks and multi-day desert camping experiences in the exact terrain where Marathon des Sables 2026 will take place. A pre-race visit to the Merzouga region is one of the most effective and affordable ways to acclimatise your body and mind to the Sahara environment before race day.
Frequently Asked Questions
How much does it cost to enter the Marathon des Sables?
The race entry fee is approximately โฌ3,400โโฌ3,800 depending on your nationality and when you register. Once you add flights, kit, food, and travel insurance, most runners spend between โฌ5,000 and โฌ8,000 in total for their first race. Early registration tends to offer slightly lower fees, and the race sells out very quickly.
What is the best shoe for the Marathon des Sables?
The best MdS shoe has a wide toe box, good cushioning for multi-day use, and compatibility with sand gaiters. The most popular choices among 2025โ2026 runners are the Altra Lone Peak 7, Hoka Speedgoat 5, and Salomon Sense Ride 5. Always buy your race shoes half a size larger than your normal size to account for foot swelling in the heat, and train at least 200 km in them before race day.
How many people have died in the Marathon des Sables?
There have been a small number of fatalities in the race’s history. The most well-known incident was in 1994 when Italian runner Mauro Prosperi became lost in a sandstorm and survived alone in the desert for nine days. The race organisation has since made major safety improvements including mandatory GPS tracking for all runners, over 200 medical staff on the course, and helicopters on standby throughout the race. The MdS is now regarded as a well-managed and medically safe event given the conditions.
How do you prevent blisters in the Sahara?
The five most effective blister prevention strategies are: training 200+ km in your exact race shoes before you arrive; wearing Injinji toe socks to prevent friction between toes; applying a lubricant such as Vaseline or Trail Toes cream to all foot contact points before every stage; taping any hot spots with Leukotape before they develop into blisters; and using sand gaiters to keep debris out of your shoes. Visit the medical tent after every stage regardless of how your feet feel.
Is the Marathon des Sables 2026 sold out?
As of mid-2026, the Marathon des Sables 2026 registration is closed. The race typically sells out 12โ18 months in advance. To secure a place in the 2027 edition, visit the official website at www.marathondessables.com shortly after the 2026 race ends, when the following year’s registration usually opens.
How many miles is the Marathon des Sables?
The Marathon des Sables covers approximately 155 miles, which is 250 kilometres. The race is split into six stages over roughly seven days. The longest single stage, known as the long march, is typically between 55 and 92 miles (90โ148 km) and is run continuously through the night without stopping.
Experience the Sahara Before Race Day
Desert Merzouga Tours offers guided desert journeys through the exact landscapes of the Marathon des Sables route โ the ideal way to acclimatise, explore, and prepare for race day in Morocco.
Plan your Morocco desert tour โ
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Information in this guide is based on official MdS regulations as of 2025โ2026. Always verify current rules at marathondessables.com before purchasing kit or registering.
