O-osawa-koya (Ōsawa-goya)

O-osawa-koya (Ōsawa-goya / 大沢小屋) is a small, historic mountain hut on the classic approach from Ogizawa (Kurobe Alpine Route area) toward Harinoki Pass and Mt. Harinoki-dake. It’s best understood as a relay hut—a practical stop that supports early starts, breaks up the ascent, and provides shelter before the steeper, more committing upper terrain.