Le Tréport is a commune in the Seine-Maritime department in Normandy, France. The three adjoining towns of Le Tréport, Eu and Mers-les-Ba…Le Tréport is a commune in the Seine-Maritime department in Normandy, France. The three adjoining towns of Le Tréport, Eu and Mers-les-Bains are known locally as the "Three Sisters". A small fishing port and light industrial town situated in the Pays de Caux, some 21 miles northeast of Dieppe at the junction of the D 940, the D 78 and the D 1015 roads. The mouth of the river Bresle meets the English Channel here, in between the high chalk cliffs and the pebbly beach. Le Tréport-Mers station has rail connections to Beauvais. Le Tréport is also a sea-side resort and home to a casino.