Kanto Minamiashigara, Kanagawa
Ashigara no Onsen Onriyu
あしがらの温泉 おんりーゆー
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
当館指定のタトゥーカバーシール(15cm × 7.5cm 1枚 330円)を2枚までで完全に隠すことができる場合はご入館いただけます。 但し、タトゥーカバーシールのご使用を拒否される方・カバーシールで覆いきれない大きさのタトゥーの方。当館のルールを守っていただけない方・タトゥーの有無にかかわらず反社会的勢力の方のご入館はお断りいたします。
In short: Tattoos must be fully covered with up to two 15 × 7.5 cm cover stickers (330 yen each).
Where it is
Kanto region, Kanagawa prefecture. About 9 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.