Lake Kussharo

屈斜路湖

Japan's largest volcanic caldera lake with pristine natural beauty and hot spring villages along its shores. Known for excellent hiking, scenic camping, and access to the Akan National Park wilderness.

Things to do

• Lake Kussharo Circumference Hike — A multi-day trek around the entire 57 km shoreline offers stunning caldera views, pristine forests, and access to remote hot spring inlets.
• Kohan Park Walk — A scenic lakeside park in Teshikaga with walking trails, observation points, and access to nearby Kussharo-ko Onsen hot spring village.
• Mount Io Hiking — A volcanic mountain on the lake's eastern shore offering panoramic views of the caldera and geothermal features, accessible via a 1-2 hour trail.
• Kayaking and Canoeing — Paddle across the pristine lake waters to experience the caldera from water level, with guided tours available from local operators.
• Akan National Park Exploration — Access the adjacent national park's hiking trails, including routes to Lake Akan and the scenic Oniishidaki waterfall.
• Winter Ice Fishing — During frozen winters, try traditional ice fishing on the lake or visit the famous lake monster hotspot where locals and tourists gather on the ice.
• Hot Spring Bathing at Kotan Onsen — Soak in naturally heated outdoor baths with views of the lake at this traditional hot spring village nestled on the northern shore.

Food to try

• Himemasu (small char) — These small freshwater fish native to Lake Kussharo are typically grilled whole or prepared in miso soup, offering a delicate lake-fresh flavor.
• Marimo Donburi — A rice bowl topped with local vegetables and sometimes fish, inspired by the famous marimo (moss balls) found in nearby Lake Akan.
• Wild boar sukiyaki — Slow-cooked thinly sliced wild boar from Hokkaido's forests, served hot-pot style with vegetables and local ingredients in onsen villages.
• Fresh trout from the lake — Grilled or sashimi-style preparations of rainbow trout caught locally, often served at lakeside restaurants and onsen lodges.
• Corn and dairy products — Hokkaido's renowned sweet corn and milk-based desserts are staples in lakeside cafes and served fresh at roadside farm stands nearby.

Local customs & good to know

• Onsen etiquette — When visiting the numerous hot spring villages like Kotan and Kussharo-ko Onsen, remember to wash thoroughly before entering the bath and respect quiet zones.
• Leave no trace hiking — The pristine caldera environment is protected; pack out all waste, stay on marked trails, and respect closures during seasonal wildlife protection periods.
• Kusshy the lake monster — Locals playfully reference the legendary Kusshy lake monster—embrace the lighthearted folklore and join other visitors scanning the lake, especially during winter ice seasons.
• Seasonal visiting patterns — Summer (June-August) brings peak tourism and hiking conditions, while winter transforms the lake into a frozen wonderland; spring and autumn offer solitude and dramatic natural beauty.