Ishimuro-sanso (石室山荘)

Ishimuro-sanso is a classic high-altitude mountain hut on Mt. Ontake (御嶽山), positioned around the 9th station (Kurosawa-guchi). It’s a strategic staging stop for hikers moving between the ropeway side and the upper crater/summit area—especially useful for splitting the climb, managing fatigue, and timing weather windows on an active volcano where access restrictions can change.