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Mitake Boulder: Chert Riverbed Bouldering, Best From Autumn to Spring | Japan Climbing Crags

A bouldering area on the Tama River banks in Ome, Tokyo. The rock is mostly chert, ROCKTOPO lists 271 problems from 10-kyu to 4-dan, and ROCKTOPO's season runs October to May because summer is hot and humid. Walk to the river from JR Mitake Station on the Ome Line.

Tenno-iwa: Chert Sport Climbing on Tokyo's Akikawa, Mostly 5.10–5.11, No Parking Nearby | Japan Climbing Crags

A chert sport crag in Akiruno, Tokyo: 46 routes on CLIMBING-net, 52 on ROCKTOPO (including 6 boulder problems), most of them 5.10–5.11. Both sites list it as a year-round crag; it faces northwest, so winter is cold. Take the bus bound for Kami-Yozawa from JR Musashi-Itsukaichi Station to Sorigo-bashi; the trout-fishing lot across the road has been closed to climbers since October 2019.