The site of the ancient Greek city of Helice, which was destroyed by an earthquake in 373 bc, has never been found. We propose that it was submerged as the result of seismic slip on a normal fault traceable SE of Egion and that the fault was reactivated in 1881, when Schmidt reported a fresh scarp 2 m high and 13 km in length at the same locality. Earlier movements on the fault are inferred from Lithophaga borings on coastal Sectors of the footwall which yield 14C ages representing over 6.5 m of uplift in the last 4880 years.