Mount Kumotori, Mountain peak in Okutama, Chichibu and Tabayama regions, Japan.

Mount Kumotori is a 2,017.13-meter peak on the boundary of Tokyo, Saitama, and Yamanashi prefectures, within Chichibu-Tama-Kai National Park. Its summit holds a first-class triangulation point and a boundary stone placed in 2016 for Mountain Day. The rounded top rises above hazy blue-grey ridges, and the mountain separates the Okutama and Okuchichibu ranges.

The peak received its first-class triangulation point designation in 1882 during Japan's early geographical surveying efforts. This classification reflected its importance for mapping mountainous regions and establishing accurate geographic boundaries.

The name is said to come from its height, rising into the clouds as if it could sweep them away, as recorded in the Okutama Town History. It is one of the three peaks of Mitsumine, with Myōhō and Shiraiwa, and a sacred mountain of mountain worship; with Ryōkami and Mitsumine it forms the Chichibu Three Mountains. The anime Yama no Susume shows the climb from Mitsumine Shrine, a tent night on the summit and the descent to Kamosawa.

Routes start from Kamosawa in Tabayama (5 h 30 up, 3 h 30 down) or from Mitsumine Shrine in Chichibu (5 h 20 up, 4 h 25 down); buses run from Oku-Tama and Mitsumineguchi stations. The Hozan forestry road is closed to private cars and taxis, and the Nippara forestry road may be closed to vehicles. Submit a climbing plan at trailhead posts or police boxes; winter slip accidents have occurred, and the Chichibu office distributes a safety map.

The summit is the highest point within Tokyo Prefecture and offers views of Mount Fuji during clear weather. This makes it a sought-after destination among local climbers on days with excellent visibility.