Seine-Marathon 76: Course, Route Profile & Map

Course & Elevation

Start and finish are on the low quays of the left bank, at the Prairie Saint-Sever beside the Pont Boieldieu. The course crosses the Seine into the historic centre of Rouen and then runs out, as the organiser puts it, into the surrounding communes along the river.

The profile has two halves, but not the ones you would expect: instead of one half up and one down, the same shape repeats twice. From four metres at the start the course rises to about forty-one metres by kilometre eleven, drops back to river level, and from kilometre thirty-three exactly the same rise arrives a second time. The total is 201 metres over 42.6 measured kilometres, just under sixty per cent of the course is flat, and there is not one steep metre anywhere.

Rouen sits in a Seine valley with steep wooded slopes on both sides, but you would not know it from this course - it stays down on the floor. 2026 is the eighth edition, and the weekend is unusually cut: the 5 km and 10 km are run in the dark on Saturday evening, while the marathon, half marathon and the corporate relay all go off together at 08:30 on Sunday morning.

Pacing Strategy

The only place this course asks for anything comes twice, and that is the key to it. The rise to forty metres at kilometre eleven is insignificant on fresh legs; the same rise at kilometre thirty-three is not. Run it at race pace the first time and you will have a problem the second time, at exactly the point where a marathon gets hard anyway.

The second point is the shared start. At 08:30 the marathon, the half and the four-person corporate relay all go off together, and relay runners cover their ten kilometres at a pace that will not work for you over forty-two. Over the opening kilometres on the quays, the field around you is not a reference.

The race is decided between kilometres twenty and thirty-three, on the flat riverside stretch before the second rise. Nothing there - not the terrain, not the crowds - gives the effort any structure, and the quays are long and straight. Hold cadence and effort through it and you reach the second climb with something left; drift, and you find out from kilometre thirty-three.

Training plan for Seine-Marathon 76: 12-week build

For age-group runners the Seine-Marathon 76 is a three to five-and-a-half hour effort. The demand is a steady aerobic one with no anaerobic component: no steep section, no climb that forces a change of gear, and just under sixty per cent flat.

The training emphasis is accordingly race-pace endurance on flat ground - long runs with forty to sixty minutes at marathon pace in the final third, and threshold runs of twenty to forty minutes. Hill training buys nothing here.

Specific to this course, one session is worth shaping around the repetition: the same moderate rise twice inside a single long run, once early and once after thirty kilometres, both taken at race effort. What that trains is not strength but the knowledge of how differently the same forty metres feel at two different points in a race.

Conditions are a late-September Sunday morning in Normandy: mild, often damp, frequently misty along the Seine in the first hours, with an 08:30 start. If you are also running on the Saturday evening, note that fewer than twelve hours separate the 21:00 10 km from the marathon gun - the two days are designed as separate races, not as a double.