Lake Mashū
摩周湖
A deep caldera lake in Hokkaido famous for its extreme water clarity, frequent fog, and dramatic volcanic scenery.
What it is
- A caldera lake formed by a massive eruption located in Teshikaga Town.
- Part of the Akan-Mashu National Park and designated as a Hokkaido Heritage site.
- A unique body of water with no inflowing or outflowing rivers.
- A government-managed monitoring site for global environmental changes.
What to see
- Three observation decks providing different vantage points of the water.
- Kamuishu Island, a small lava dome situated in the center of the lake.
- Extremely clear water that once recorded a world-record transparency of 41.6 meters.
- Introduced populations of rainbow trout and sockeye salmon within the lake.
When to go
- Visit during periods of heavy fog to see the lake's most famous atmospheric condition.
Notes written by Japan Gems from facts in Japanese Wikipedia.
Where it is
Lake Mashū Open in Google Maps
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