Le Tréport / Cayeux-sur-mer
After enjoying a last look at Mers-les-Bains's cliffs and Belle Epoque villas, the Vélomaritime leads you away from the coast to Bourseville. Do stray off the cycle route if you wish to stop at Le Bois de Cise or Ault, resorts that recall the Art Deco period and its fashion for sea-bathing. Up to Cayeux-sur-Mer, you then cycle through the Hable d'Ault, a long-established lagoon protected from the sea by a pebble bank and today a haven for many species of birds.
Gradients and elevation
Slope breakdown
Road types
- Cycle path
- Routes reserved for cyclists and pedestrians (greenways, cycle tracks, towpaths), separated from cars for maximum safety.
- Shared road
- Quiet minor roads with little traffic (unless otherwise stated in the stage details). Shared with cars (stay alert).
- Not specified
- Data unavailable or being assessed. Please refer to the detailed stage description.
- Provisional
- Section on a road or cycle path awaiting better-quality facilities (see stage details).
Surface
- Smooth
- Asphalt, tarmac or smooth concrete. Optimal comfort.
- Rough
- Fine gravel, compacted stabilised surface or worn tarmac. Less comfortable, vibrations possible.
- Natural
- Dirt, grass, roots or stones. Under 5%: short sections with little impact. Higher percentage: route suited to mountain or gravel bikes only.
- Not specified
- Data unavailable or being assessed. Please refer to the detailed stage description.
The route
At Tréport, the port locks are crossed on foot, then you cycle along the colorful seafront of Mers-les-Bains. Be careful of the steep slope when leaving Mers-les-Bains. The route continues on cycle paths, some of which are shared with agricultural machinery. Be careful on the descent out of Ault. Finally, in the Hâble, a few hundred meters will be on a stabilized path.
SNCF
- Nearby stations Le Tréport-Mers railway station Chemin de Fer de la Baie de Somme station in Cayeux-sur-Mer




















