| 1．Okuchichibu Mountains ・2,601 m (8,533 ft) |
| Okuchichibu Mountains (奥秩父山塊, Okuchichibu Sankai) or the Okuchichibu Mountainous Region (奥秩父山地, Okuchichibu Sanchi) is a mountainous district in the Kantō region and Kōshin'etsu region, Japan. It covers the western part of Tokyo, the western part of Saitama Prefecture, the southwestern part of Gunma Prefecture, the southeastern part of Nagano Prefecture, and the northern part of Yamanashi Prefecture. Oku (奥, oku) means the interior, Okuchichibu means the interior of Chichibu (秩父, chichibu). The meaning of the word Okuchichibu is based on the point of view from the Kantō region. This mountain area consists of folded mountains and ranges from 1000 to 2600 meters in height. Mount Kita Okusenjō (北奥千丈岳, Kita Okusenjō-dake) is the highest at 2601m. Most of the range lies in the Chichibu Tama Kai National Park (秩父多摩甲斐国立公園, Chichibu Tama Kai Kokuritsu Kōen).[1] |
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| 2．Mount Kumotori ・2,017 m (6,617 ft) ・Okutama Mountains, Okuchichibu Mountains |
| Mount Kumotori (雲取山, Kumotori-san) stands at the boundary of Tokyo, Saitama, and Yamanashi Prefectures on the island of Honshū, Japan. With an elevation of 2,017 metres (6,617 ft),[1] its summit is the highest point in Tokyo. It separates the Okutama Mountains and the Okuchichibu Mountains. While it marks the end of the Ishione (石尾根) mountain ridge that begins near the JR Oku-Tama Station, the highest mountain ridge in Tokyo, its remote location amongst a group of mountains from both mountain ranges makes access difficult. |
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| 3．Mount Kobushi ・2,475 m (8,120 ft) ・Okuchichibu Mountains |
| Mount Kobushi (甲武信ヶ岳, Kobushigadake) is a mountain on the border of Saitama, Yamanashi, and Nagano prefectures in Japan.[1] The mountain is the source of the Arakawa and Shinano Rivers.[2][3] It is one of the 100 Famous Japanese Mountains. |
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| 4．Mount Sanpō ・2,483 m (8,146 ft)[1] ・Okuchichibu Mountains |
| Mount Sanpō (三宝山, Sanpō-yama) is a mountain on the border between Chichibu, Saitama and Kawakami, Nagano in the Okuchichibu Mountains of Japan. At a height of 2,483 m (8,146 ft), it is the highest point in Saitama.[2] |
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