Kanto Hakone, Kanagawa
Hakone Yuryo
箱根湯寮
Name in Japanese. Look for this on the sign, or show it to a taxi driver.
Tattoos allowedStated by the facility
Super sento (large day-bath complex). Water source not checked; see the official page

Tattoo rule
Tattoos allowedStated by the facility
What the official page says
タトゥーフレンドリー推進への取り組み(タトゥーによる入浴制限を解除しております) タトゥーフレンドリー推進への取り組み
In short: The official page says guests with tattoos can use the bath.
Where it is
Kanto region, Kanagawa prefecture. About 1 km in a straight line from Hakone.
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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.