Eleusis, Elefsina (Greek: Ελευσίνα Elefsina, Ancient Greek: Ἐλευσίς Eleusis) is a town and municipality in West Attica, Greece. It is situated about 18 km northwest from the centre of Athens. It is located in the Thriasian Plain, at the northernmost end of the Saronic Gulf. North of Eleusis are Mandra and Magoula, while Aspropyrgos is to the northeast.Eleusis is the seat of administration of West Attica regional unit.