After Reitoi, Pausanias came across a river, called Kephisos, like the main Athens river. Today it is dry and known as Sarantapotamos. It used to be a torrent river, flooding the Thriasian field. Pausanias crossed over a stone bridge built by emperor Hadrian, preserved until today.
Pausanias arrived at Eleusina about 1 km after the
Kephisos bridge. As an initiate under oath he did
not disclose anything of the ritual happenings, which constitute a general gap of information in the ancient texts, exactly due to the oath of the initiates. Excavation has filled this gap partly, as it has exposed the
Telesterion, the main ritual building, as well as ceremonial paraphernalia and relief representations of the worhipped deities. As mentioned above, the Eleusinian Mysteries
were in honour of Demeter and her daughter Persephone coming from Hades. Thus, rituals were related to fertility and the regeneration of earth. The procession and the initiation of new members was the most important event
of this cult.