Noboribetsu Hell Valley (Jigokudani)

Hokkaido’s grandest hot-spring resort sits directly downstream from a hole in the earth. Noboribetsu Jigokudani — yes, another “Hell Valley” — is a 450-metre-wide volcanic crater of rust-red and sulfur-yellow rock that hisses steam from a hundred vents and pipes scalding mineral water down to the baths below.

Why It’s Interesting

The valley is genuinely otherworldly: a barren, steaming amphitheater you can walk into on wooden boardwalks, with bubbling pools and the steaming hot lake of Oyunuma at its head. The town has cheerfully embraced the “hell” branding, stationing grinning demon (oni) statues around the streets as guardians and mascots. It’s spooky geology with a wink.

Best Time to Visit

Striking year-round — the red rock and white steam never quit — but October adds a ring of fiery maple foliage around the rim, which is the postcard shot.

Getting There

Buses climb from Noboribetsu Station to the onsen town; the valley entrance is a short, mostly flat walk from the main street, making it an easy stop before or after a soak.