Mers-les-Bains is situated 25 miles (40 km) west of Abbeville, near the mouth of the River Bresle, on the border between Picardie and Normandy.
With its neighbouring towns Eu and Le Tréport
so close by, it appears as one large conglomeration. They are
collectively known as the 'three sister-towns' (les trois villes
soeurs).