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Chubu-Sangaku NP, Nagano
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About 60,000 years ago, a glacier reached into the Yokoo area and left a moraine. Geologists named this ancient advance the Yokoo Stadial—this quiet valley lent its name to a chapter of the Alps’ Ice Age history.
On the Karasawa trail beyond Yokoo, the old Yokoo Rock Shelter is built from boulders about 5 m across. A glacier 5 km long carried these giant blocks from the high peaks; early climbers sheltered in the gaps between them.
Yokoo once served the timber trade: during the Edo era, it was one of 10+ permanent woodcutters’ huts in Kamikochi. Crews from 4 Azusa Valley villages logged and hauled wood for the Matsumoto Domain for 250+ years.
Yokoo Sanso began as Ichinomata Hut, opened by founder Yamada Riichi in 1925 on a route to Jōnen. It burned in 1943; the old trail has vanished from maps, while Yokoo Hut opened here in 1947.
Yokoo marks a fish boundary: Kamikochi’s guide says native Nikko char survive only upstream, while stocked trout and hybrids predominate downstream toward Myojin. Fish releases began in 1925, reshaping the valley’s fish life.
An old Yokoo Sanso ad promised a bath after descending Yari, before Hotaka or Chogatake the next day. The guest-only bath is no hot spring; the off-grid lodge supplies its own water and electricity.
Cross Yokoo Bridge into Yokoo Valley and the 600 m Byobu-iwa rises on the way to Karasawa. This sheer wall is a celebrated climbing destination—one of Yokoo’s quiet trail branches leads straight to a giant rock face.
Near Yokoo Sanso, rockfoil (iwakagami) grows in striking clusters, flowering around late May to mid-June. Its Japanese name means “rock mirror,” inspired by glossy leaves that shine like little mirrors on rocky slopes.
Yokoo’s big crossing changed shape with the trails: a bridge first appeared in front of the mountain lodge in 1961; in 1999 it was replaced by today’s suspension bridge across the river, marking the route toward Karasawa and Hotaka.
