Honzawa Onsen

Past Hirayu, the road into the Okuhida valley follows the Gamata River further up into the mountains until the trees close in and the paving ends at a small cluster of buildings. Honzawa Onsen sits at around 1,100 meters in the narrowest section of the upper Okuhida valley, with the Hida Mountains rising on both sides and the river audible from every building. From Hirayu Bus Terminal, a local bus covers the route in about twenty minutes, though the last service back runs in the early evening and missing it means a long walk. Snow closes the upper road for part of winter, and the timing of the seasonal reopening determines when the year's first guests can return.

The spring chemistry at Honzawa is calcium sulfate and sodium bicarbonate with a trace of sulfur, and the water emerges at 60 degrees with a pH of 6.9, which is almost perfectly neutral. In the bath it reads as milky or faintly translucent white, softer than the stronger sulfur springs at nearby Shin-Hotaka but with a similar mineral depth. The calcium sulfate content is what gives the water its particular skin feel: not the silky alkalinity of a high-pH simple spring, but a smoother, slightly velvety quality that coats without clinging. The sulfur note is mild, the kind you register once and then forget.

The valley setting at Honzawa produces one of the more striking outdoor bathing situations in the Okuhida region. The outdoor pools at the main facility here look directly up the river gorge toward the Hida ridgeline, and in autumn the beech and maple canopy on the slopes above turns yellow and red from the valley floor up to the treeline in sequence as the weeks progress. By late October, when the upper slopes are already bare, the lower forest is still in full color, and the steam from the outdoor baths rises through the cold air against that backdrop in a way that is hard to photograph and easy to remember.

The Shin-Hotaka Ropeway, Japan's only double-decker gondola, is about fifteen minutes further up the valley from Honzawa and lifts riders to a platform at 2,156 meters above sea level. Most visitors who stay at Honzawa use the ropeway as the main daytime activity, returning to the outdoor baths in the late afternoon. The combination of high altitude views, cold mountain air, and then the warm neutral water of a calcium sulfate pool at dusk is the particular pleasure this corner of Gifu does better than most places in the Japanese Alps.