Sant'Elpidio a Mare is a town and comune in the province of Fermo, in the Marche region of Italy. Sant'Elpidio a Mare is located on a ridge of M…Sant'Elpidio a Mare is a town and comune in the province of Fermo, in the Marche region of Italy. Sant'Elpidio a Mare is located on a ridge of Marche Apennine, elevation 251 metres above sea level, between the lower river valleys of the river Tenna and Ete Morto, 9 kilometres from the Adriatic Sea.