Mount Tomi, Mountain summit in Minamiboso, Japan

Mount Tomi is a twin-peaked mountain in the Bōsō Hill Range, with the northern Konpira Peak reaching 349.5 m and the southern Kannon Peak 342 m. The north summit holds a triangulation point, the Konpira Shrine and the Eleven Provinces Observation Deck; the south summit has a Kannon hall. The saddle between the peaks is crossed by a paved forest road.

The name comes from Ame-no-tomi-no-mikoto, a mythological figure connected to Emperor Jinmu. This legendary origin is linked to the early development of the Boso Peninsula region.

The mountain features in Kyokutei Bakin's Edo period novel Nanso Satomi Hakkenden, where it serves as the residence of Princess Fuse. This literary connection shapes how locals and visitors perceive the place today.

The site is accessible by bus from Iwai Station on the JR East Uchibo Line to the trailhead in Minamiboso. The climb is moderate and takes roughly two to three hours to visit both peaks.

The north peak has a triangulation point, the Konpira Shrine and a viewing platform called Jūisshū Ichirandai. The south peak holds a Kannon hall. In the saddle between the two peaks stands a wooden post marking the spot where, in Bakin's novel, the eight dog warriors end their lives as hermits.