I study the cult of Mt.Fuji in the late Edo period. I study the various beliefs and religions that intersect on Mt. Fuji and inform this popular cult. I investigate the deities that are linked to Mt. Fuji, and the ways in which the sacred space of this mountain (and its position within Japan) were "mapped." Through this cult common people in the Kanto area developed a nuanced understanding of their reality at the individual, geographic, as well as cosmic levels. I call this "popular episteme."