Noboribetsu Onsen

Noboribetsu Onsen (登別温泉) is a serious onsen: you can smell the sulphur from miles away. While the town is small, there are countless springs here, sending up mineral-rich waters. The baths received great fame when the town was designated as a health resort for injured soldiers following the 1904–05 Russo-Japanese War and remain Hokkaidō's most famous onsen today.