Eleusina 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. It is the seat of administration of West Attica regional unit. It is best known for having been the site of the Eleusinian Mysteries, one of the most famous religious events of the ancient Greek religion, and the birthplace of Aeschylus, one of the three great tragedians of antiquity. Today Eleusina is a major industrial center, with the largest oil refinery in Greece.
From as early as 1700 BC up to the 4th century AD, Eleusina was the site of the Eleusinian Mysteries, or the Mysteries of Demeter and Kore. These Mysteries revolved around a belief that there was a hope for life after death for those who were initiated. Such a belief was cultivated from the introduction ceremony in which the hopeful initiates were shown a number of things including the seed of life in a stalk of grain.
Today, the city has become a suburb of Athens, to which it is linked by the freeway, the Athens metropolitan freeway (Attiki Odos), and Athens metro (transit). A toll post named after the community is on the westbound lanes of GR-8A. North of Eleusis are Mandra and Magoula, while Aspropyrgos is to the northeast. The town lies at the northern apex of the Gulf of Eleusina.