Mount Tomi (富山, Tomi-san) is a mountain on the border of the city of Minamibōsō, in southern Chiba Prefecture.

According to tradition Ame-no-tomi-no-mikoto, historically associated with the Emperor Jinmu, developed the Bōsō Peninsula region, and is now associated with the nearby Awa Shrine.

The western foot of Mount Tomi is rich with broad-leaved trees, including castanopsis, live oak, camellia, as well as large stands of Japanese cedar.

[1] Tomi-san is the setting for Kyokutei Bakin's 106 volume epic novel Nansō Satomi Hakkenden (南總里見八犬傳), published late in the Edo period between 1814 and 1842.

[3] The hiking trail that leads to Mount Tomi is accessible by bus from the Iwai Station in Minamibōsō via the JR East Uchibō Line.