Aratashi Minakami
Every one of the 42 rooms has its own open-air bath filled with natural onsen — a soft alkaline spring, in a quiet concrete building above the gorge.

Minakami Onsen 水上温泉 — Gunma
In-room bath + reservable private bath
Mukoyama Onsen water is poured into three reservable baths, free for every guest, and most of the nine rooms have their own open-air bath — a small, food-loved inn in the hills.
You get both kinds of private here — a bath of your own, and reservable ones for the long soak. Most guests use both before checkout. You probably will too.



Private-bath and water facts were checked against the property's official site and Japanese booking pages in November 2026. Room plans change — confirm the private bath is included in the plan you book.
More in Minakami Onsen
Every one of the 42 rooms has its own open-air bath filled with natural onsen — a soft alkaline spring, in a quiet concrete building above the gorge.
A lockable family bath is free for guests, about 40 minutes at a time, in a riverside lodge run by a mutual-aid association (open to general guests too).
A hot-spring theme park of a ryokan: 18 open-air baths scattered over the grounds, every one used privately, free, around the clock — plus rooms with their own open-air baths.