Kanto Hadano, Kanagawa
Hadano Yugawara Onsen Manyo no Yu
はだの・湯河原温泉 万葉の湯
Name in Japanese. Look for this on the sign, or show it to a taxi driver.
Allowed with conditionsStated by the facility
Super sento (large day-bath complex). Water source not checked; see the official page

Tattoo rule
Allowed with conditionsStated by the facility
What the official page says
※入れ墨あるいは入れ墨類似シール(タトゥーシール)・ボディペイントをされている方のご入館は固くお断りしております。ただし、当館が定めるルールを守って頂ける方に関しては、ご入館頂けます。詳細については、当館のスタッフにご確認ください。
In short: Tattoos are refused in principle, but guests who agree to follow the facility's tattoo rules can enter. Ask staff for details.
Where it is
Kanto region, Kanagawa prefecture. About 19 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.