A small farming village situated in the Pays de Caux, some 24 miles (39 km) west of Dieppe at the junction of the D68 and the D105 roads. Huge chalk cliffs rise up from the pebbly beach and overlook the English Channel, forming the northern border of the commune's territory.
Heraldry
The arms of Saint-Martin-Sylvain are blazoned : Azure, a chevron Or semy of trefoils between 2 lances and a man's head argent, and on a chief argent a lion between 2 hammers gules.