My marathons

Seine-Marathon 76

Run on 27 September 2026. Next race: date not out yet. Rouen, France

The Seine-Marathon 76 is a course of 42.2 km with 97.4 m of climbing. Its lowest point is 2 m and its highest 37 m above sea level.

Rouen Cathedral
Rouen Cathedral. Photograph by Kaelkael, CC BY-SA 3.0 via Wikimedia Commons . Course line © OpenStreetMap contributors

At a glance

Next race
Date not out yet
Last run Sun 27 Sept
Distance
42.2 km26.2 mi
Marathon · Half marathon · 10K · 5K
Total climb
97.4 m320 ft
Highest point 35 m115 ft above lowest

The course

Drag along the profile

The 2026 Seine-Marathon 76 started on Sunday 27 September at 8:30 from the Hôtel du Département de Seine-Maritime in Rouen, and all its races shared a finish on the Seine quays.

Start, finish

© OpenStreetMap contributors

Height drawn many times taller than life · GEDTM30

Course elevation profile, 8× vertical exaggeration Elevation along the course from km 0 to km 42. The trace runs between 2 and 37 metres, a range of 35 metres, drawn at 8 times vertical exaggeration so the shape is legible. Smoothed over 1 km before this profile was derived. An unsmoothed urban surface carries the buildings and would assert a climb that is not there. The dashed stretches are bridge decks: Pont Boieldieu, km 0 to 0.2; Pont Corneille, km 3.9 to 4.2; Pont Jeanne d'Arc, km 16.4 to 16.6; Pont Corneille, km 24.3 to 24.6. A bare-earth model reads the ground or the water beneath a bridge, not the deck the runner is on, so those runs are interpolated between the ground either side rather than measured, and they under-report the real climb across a span.
0 10 20 30 40 km
0 10 20 26.2 mi

Dashed: bridge

Your 5 gels, at the orange marksFor a 4:00 finish, one every 40 minutes

  1. km 7mile 4.4
  2. km 14.1mile 8.7
  3. km 21.1mile 13.1
  4. km 28.1mile 17.5
  5. km 35.2mile 21.8

Get them on AmazonAmazon partner link

  • The 2026 race: one start, one finish on the quays27 September 2026, 8:30 start; 20,189 runners across all races.
  • Two low rises on a course near sea levelHigh point 37 m near 31 km; low point 2 m at the finish.
Course notes 2 short reads on the course
Whole courseLandmarkThe 2026 race: one start, one finish on the quays27 September 2026, 8:30 start; 20,189 runners across all races.

A record 20,189 runners took part across the 5 km, 10 km, half marathon and marathon. Its marathon course mixes the Seine and history: the quays, the historic centre of Rouen and the city’s emblematic places over 42.195 km. The 10 km ran the evening before, on Saturday 26 September.

Sourced

Whole courseGradientTwo low rises on a course near sea levelHigh point 37 m near 31 km; low point 2 m at the finish.

The course starts at about 8 m, reaches about 37 m near 11 km, drops back to near sea level by 19 km, and stays low through the half. The second rise peaks at about 37 m near 31 km, and the last 10 km descend to the finish at about 2 m beside the Seine. Climbing totals 97 m.

Measured

Race fuel

Energy gel
An energy gel sachet
Illustration · drag to turn

5 gels for Rouen, plus 1 spare

Finish

One every 40 minutes, the orange marks on the profile. Rouen stays within 35 m115 ft of height, so they go by the clock:

  1. km 7mile 4.4
  2. km 14.1mile 8.7
  3. km 21.1mile 13.1
  4. km 28.1mile 17.5
  5. km 35.2mile 21.8

Our pick: SiS BETA Fuel gel, box of 6, strawberry and lime. 40 g of carbohydrate a gel, about twice a usual gel, from two kinds of sugar your body takes up side by side.

Easy to forget on race morning: pack them with your bib the night before.

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In Canada the button opens GU Energy Gel, Salted Caramel, 24-pack, the best seller there.

Outside the Netherlands, Belgium, Germany, Austria and Switzerland, the UK and Ireland, Spain and Portugal, Italy, the rest of the EU and Canada the button opens GU Energy Gel, Chocolate Outrage, 24-pack on Amazon.com, the best seller there.

Anti-chafe
A small balm stick
Illustration · drag to turn

Compeed anti-blister stick, 8 ml

An invisible layer before the start keeps seams, straps and shoes from rubbing skin raw.

Put it on before you leave for the start: heels and toes, inner thighs, under a bra or heart-rate strap.

Try it on a long run first, like everything you use on race day.

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Number belt
A race number belt
Illustration · drag to turn

Compressport Race Belt

Holds your bib without safety pins through your top, with loops for up to 8 gels.

Clip the bib on the night before, so it goes on with your shorts in the morning.

Keep the number on the front, where officials and photographers can see it.

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Electrolytes
A tube of electrolyte tablets
Illustration · drag to turn

SiS Hydro electrolyte tablets, tube of 20

One tablet in a bottle puts back some of the salt you sweat out.

One tablet in 500 ml of water in the hour before the start.

Only if you have used them in training: nothing new on race day.

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Blister plasters
A pack of blister plasters
Illustration · drag to turn

Compeed blister plasters, medium, 6

One in a pocket cushions a blister if one starts.

Put it on clean, dry skin and leave it until it comes off by itself.

Give a couple to whoever comes to cheer, so they are there at the km you need them.

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Runner talk Questions, tips and race reports from other runners about the course and the city.

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