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IRONMAN World Championship 2025: A deep dive into the unique test of Nice course

We take a close look at the swim, bike and run courses which face the world's best long-distance male triathletes
News Director
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Sunday will be the last time for a while that the IRONMAN World Championship takes place in the French coastal city of Nice.

Since 2023 the Cote d’Azur has played host to either the men or women but from 2026 onwards both will head back – on the same day – to its spiritual home of Kona.

Nice will still welcome the world’s best 70.3 athletes going forward but it signs off at full distance in style this week as a stellar men’s field lines up, including four former champions – Sam Laidlow, who won on home roads the last time it was held here in 2023, Patrick Lange, Kristian Blummenfelt and Gustav Iden.

All have spent time on the French Riviera recceing what lies in store and here’s what awaits them and the many age-groupers bidding for their own glory…

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Swim course

The swim, which takes place in the azure blue waters of the Mediterranean Sea, is effectively a two-lap course, with the athletes first completing a 1900m out and back loop before heading around a set of buoys just off the shore for a second loop of 1925m.

Starting from the water off the pebble beach of the Plage des Ponchettes, the course is a total of 3850m and runs perpendicular to the famed Promenade des Angles, with transition situated just off the beach.

With close to 900m of clear water for the fastest swimmers to the first buoy, this course offers a perfect chance for the front pack to set a hard tempo from the start and get a gap on the field.

IMWC Nice 2025 swim course
Graphic courtesy of IRONMAN

Dependent on the weather, the water in the Baie des Anges can be choppy and rough or glassy and smooth, with the conditions likely to be determined by the wind over the course of the race weekend, with temperatures likely to be upwards of 24 degrees.

Bike course

Without a doubt, the bike course and the challenges it presents is the biggest plus point of Nice hosting the World Championships. It’s a very different test to Kona, with the city’s proximity to the Alps making it a climber’s paradise on race day.

Just one loop of 180.2km, the course makes its way out of the city via the nearby hillside villages, as they start of at an elevation of just 22m and climb to just under 1200m in the mountains for a total elevation gain of 2427m across the length of the ride.

After an initial gradual climb up into the hills, the first major climb in the Alpes-Maritime region starts past Tourettes-sur-Loup and ends just before Caussols, climbing almost 900m in just under 20km of cycling.

From the 60km mark, the course is undulating for another 60km, before the athletes take on one of the most challenging aspects of the course, the technical descent of Clues de Gréolières from the 120km mark.

IMWC Nice 2025 bike course
Graphic courtesy of IRONMAN

After another small climb, the course winds its way back down to the coast and at Saint Laurent du Var rejoins the outbound route past the airport and back into the city centre towards transition.

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Run course

The best men in the world will battle it out for the title along the Promenade des Anglais over a marathon which spans the length of the iconic boardwalk.

The four-loop, 42.2km course will head out from transition towards the Nice International Airport, passing sights such as the Negresco Hotel whilst hand-railing the backdrop of the Mediterranean.

With just 33m of elevation gain from start to finish, the best runners in the field will hope they have enough left in their legs to put a solid marker down, with the leaders likely to be constantly exposed to the chasers behind them on the out and back course.

IMWC Nice 2025 run course
Graphic courtesy of IRONMAN

Patrick Lange ran through the field on the marathon in Kona last year – and nearly did the same here in 2023 – so his position heading out of T2 will be crucial.

Jonathan Turner
Written by
Jonathan Turner
Jonathan Turner is News Director for both TRI247 and RUN247, and is accustomed to big-name interviews, breaking news stories and providing unrivalled coverage for endurance sports.  
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