Kanto Narita, Chiba
Yamato no Yu (Narita)
Name in Japanese. Look for this on the sign, or show it to a taxi driver.
Day-trip hot-spring complex near Narita Airport. Natural hot spring (the facility calls itself a natural onsen)

Tattoo rule
What the official page says
刺青、ファッション・タトゥーがある方もご利用いただけます。創業以来、大和の湯では刺青がある方の入館を特にお断りしてはおりません。
People with traditional or fashion tattoos can use the facility. Since opening, Yamato no Yu has never refused entry because of tattoos.
The official FAQ says guests with traditional or fashion tattoos can use the baths.
About 15 minutes by car from Narita Airport. Children under school age are not admitted.
Where it is
Kanto region, Chiba prefecture. About 48 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.