Kanto Narashino, Chiba
Tennen Onsen Yuneru
天然温泉 湯~ねる
Name in Japanese. Look for this on the sign, or show it to a taxi driver.
Allowed with conditionsStated by the facility
Kenko Land (large bath and rest complex). Water source not checked; see the official page

Tattoo rule
Allowed with conditionsStated by the facility
What the official page says
タトゥーを入れているのですが、温泉に入れますか? 館内で販売している肌隠しシートで全て隠すのが条件でご入浴可能です。
In short: Tattoos must be fully covered.
Where it is
Kanto region, Chiba prefecture. About 22 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.