Iwanai Onsen

Iwanai Onsen is situated in Iwanai, a Sea of Japan coastal town on the Shakotan Peninsula base in southwestern Hokkaido, where the cold Tsushima Current meets the volcanic highlands of the Niseko region to create a distinctive coastal climate of heavy snowfall, rich seafood grounds, and dramatic sea cliffs. The Raiden area near Iwanai is particularly celebrated for the quality of its sea urchin, crab, and squid, making the town a pilgrimage destination for seafood lovers alongside its onsen attractions. The hot springs here draw on geothermal sources from the Niseko volcanic belt, providing sodium-rich mineral bathing with views across the Sea of Japan toward the distant coasts of Russia's Primorsky Krai on clear days, offering a quintessentially remote and rugged Hokkaido coastal experience.