Chubu Yamanouchi, Nagano
Ryuoo Mountain Resort Yu-no-Eki Ponpoko
竜王マウンテンリゾート 湯の駅ぽんぽこ
Name in Japanese. Look for this on the sign, or show it to a taxi driver.
Tattoos allowedStated by the facility
Day-trip onsen at a ski resort. Hot spring (spring details not checked)
Tattoo rule
Tattoos allowedStated by the facility
What the official page says
Q タトゥーにつきまして タトゥーのある方もご入浴いただけます。
In short: The official FAQ says guests with tattoos can bathe.
Where it is
Chubu region, Nagano prefecture. About 171 km in a straight line from Tokyo.
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Rules can change. Check the official page on the day you go. Any paid link is labelled next to the button. We have not visited this bath ourselves.