Home to the 2000-year-old Mitsumine Shrine (三峯神社 Mitsumine-jinja, mitsuminejinja.or.jp) on the summit of this fairly tame 1100m mountain. The easiest methods of access are via cable car from Chichibu Railway Mitsumine-guchi (¥ 950/1650 one-way/return, every 30 min from 09:00 to 16:30) or direct bus from Seibu Chichibu station (¥900, 5 daily). Still, you may find it more rewarding to hike up (or down), there are some nice views and waterfalls along the way and you can pop in at the shrine ryokan Kounhaku's onsen baths for a refreshing dip afterwards (¥500).
© OpenStreetMap contributors
雲取山
Its summit is the highest point in Tokyo.
橋立鍾乳洞, Hashidate Shounyudo
大菩薩嶺
One of the 100 Famous Mountains of Japan.
御岳山
Follows a very similar pattern, with the Musashi-Mitake Shrine (武蔵御嶽神社) up top. Take a bus from Mitake Station to the Mitake cablecar (10 min, ¥270), then the cable car up to the shrine (¥1090 return).