The IGN TOP 25 hiking map No. 2107 OT covers the following area: Le Tréport, Saint-Valery-sur-Somme, Bay of Somme.
- Contour lines at 10-metre intervals.
- Detailed legend: vegetation, rocks, transport routes down to the smallest paths, buildings down to individual sheds, woodland, isolated trees, rivers, springs and more.
- Waymarked trails and tourist information are shown.
- Scale: 1:25,000 (1 cm = 250 m).
Municipalities covered: Le Tréport, Saint-Valery-sur-Somme, Friaucourt, Fressenneville, Méneslies, Buigny-lès-Gamaches, Flocques, Tully, Yzengremer, Ochancourt, Ponthoile, Boismont, Arrest, Miannay, Quesnoy-le-Montant, Cahon, Friville-Escarbotin, Franleu, Étalondes, Saigneville, Noyelles-sur-Mer, Estréb'uf, Ault, Mers les Bains, Cayeux sur Mer, Eu, Feuquières en Vimeu, Le Crotoy.
Places to discover: Bay of Somme, Mollières, Cap Hornu, St-Laurent, Marins Chapel.