Zao International Hotel
Three different reservable baths — forest, village and mountain — each pouring Zao's milky, strongly acidic sulfur water straight from the source, in a big slope-side hotel.

Yamagata — 蔵王温泉
5 stays with a private bath · High in the Zao mountains in Yamagata — a strongly acidic sulfur spa town under the ski slopes
Every property listed here has a private bath — a reservable private bath or an open-air bath in your own room — so tattoos are a non-issue, and so is privacy.
Yamagata · Getting there: High in the Zao mountains in Yamagata — a strongly acidic sulfur spa town under the ski slopes
Three different reservable baths — forest, village and mountain — each pouring Zao's milky, strongly acidic sulfur water straight from the source, in a big slope-side hotel.
A small inn in front of the Zao bus terminal whose own source bubbles up inside the building — four reservable baths, every one of them 100% free-flowing source water at pH 1.5.
A 300-year-old Takamiya inn: book a Hinakura detached room for your own open-air bath of 100% free-flowing source water, or reserve the private bath — three house sources feed nine tubs here.
Two cosy reservable baths for two — one indoors, one open-air — in milky-white Zao sulfur water, and day visitors can book them too.
A Takamiya-group inn built around its strongly acidic sulfur source (pH 1.25-1.6) — the ceramic semi-open-air bath can be reserved, and the shared baths run free-flowing all night.
Prices are a guide from rates checked on Klook in November 2026 and change by date and room type — always confirm the live price on the booking page.