From remote mountain baths to wild springs bubbling up in nature — explore onsens across Japan by theme.
Rated 4+ overall — truly hidden hot springs
Access difficulty 4+ — springs beyond rough roads and trails
Milky white water with a sulfur scent
pH 3 or below — tingling, invigorating water
pH 9 or above — silky-smooth beauty baths
Untamed hot springs bubbling up in nature