Mt. Shiomi, Mountain summit in Minami Alps, Japan

Mount Shiomi is a twin-peaked summit on the main ridge of the Akaishi Mountains, with a western peak at 3,047 m carrying a second-order triangulation point and an eastern peak at 3,052 m, the highest point in Ina City. Its dome-shaped profile resembles an iron helmet when seen from afar. The two peaks are less than 100 m apart.

In 1902 Toranosuke Ienaka climbed to the summit for a surveying investigation, after which a triangulation station was set up on the western peak (3,047 m), a second-order point named "Shiomiyama". In 1917 members of the Keio University mountaineering club led by Tsuneshichi Nakajo reached the top while traversing from Nishiyama Onsen to Akaishi-dake, and in 1918 Ritaro Kogure and Hisakichi Takeda climbed it during a traverse of the northern Southern Alps. The summit area was included in Minami Alps National Park when it was designated on 1 June 1964.

The name Shiomi is explained by several theories: that the sea of Suruga Bay is visible from the summit, that salt was produced at the foot of the mountain, or that smoke from salt-making fires could be seen from the top. In Kashio, a hamlet of Ōshika at the foot of the mountain, the Kashio River and Shiokawa River flow, and natural brine springs at Kashio Onsen fed salt-making facilities in the Meiji era. The mountain is listed among the 100 Famous Japanese Mountains, the New 100 Famous Japanese Mountains and the 100 Famous Mountains of Shinshu.

The usual route starts at the end of the Torakura forest road, reached by a summer bus from Ina-Oshima Station (mid-July to late August) or by car to the Koshiji gate, 1.8 km before the trailhead. The round trip via Mitsushi Pass and the Shiomi hut is graded 7 of 10 for effort and D for difficulty, best from mid-June to early October. The Shiomi hut, the closest to the summit, requires advance booking.

The summit is split into two peaks about 100 m apart: the east peak at 3,052 m is the higher, but the second-order triangulation point named "Shiomiyama" sits on the 3,047 m west peak. The summit is the highest point of Ina City, Nagano Prefecture.