Kawayu Onsen

Within Akan-Mashu National Park, between Lake Kussharo and Mount Io, lies Kawayu Onsen. Its water is said to be groundwater from Lake Mashu heated beneath Mount Io, and it is known as a strongly acidic sulfur spring. A steaming hot river runs through the town, and the scent of sulfur and rising vapor lend it deep atmosphere.

Highlights

- Rich, strongly acidic water that every inn declares is free-flowing from the source - The rugged scenery of Mount Io, also called Atosanupuri, venting steam - The warm hot river that flows through the town

Enjoying the Seasons

Summer lets you pair bathing with strolls to Lake Kussharo, Lake Mashu, and Mount Io. Winter brings swans arriving at Lake Kussharo and splendid vapor rising over the snowfield. In the freezing eastern Hokkaido winter, the acidic water warms the body thoroughly.

Access and Basic Information

- About 10 minutes by bus from JR Kawayu Onsen Station - Roughly one hour and 40 minutes by car from Tancho Kushiro Airport - Close to Lake Kussharo and Mount Io - Spring type is acidic sulfur spring

A Quick Tip

Strongly acidic water is harsh, so those with sensitive skin should keep soaks short. Rinsing lightly with fresh water afterward eases the strain on the skin. When strolling Mount Io, take care not to get too close to the steam vents.