Lake Mashu
Mashu-ko
A mystical caldera lake featuring the deep, enchanting 'Mashu Blue.' Experience the breathtaking beauty of the shimmering waters under a clear sky…Explore this spot
Lake Mashu is a caldera lake located within the Akan-Mashu National Park in Hokkaido. Known since ancient times as a mystical place, it is even referred to in the Ainu language as 'Kamuy-to' (Lake of the Gods).
What makes it special
About Lake Mashu
- The deep blue 'Mashu Blue' waters look especially vibrant on sunny days.
- The rooftop terrace at Lake Mashu Kamui Terrace is a modern, comfortable space to relax while enjoying the view.
- The Ura-Mashu Observatory offers a unique perspective that is often less affected by mist.
- Try snowshoe trekking in winter to experience the breathtaking snowy landscapes.
- Plan your visit around the seasons to see either the bright summer skies or the white frost of winter.
Photo gallery
All photos
Weather forecast
Mon
8/3
23°/13°
0%
Tue
8/4
21°/14°
0%
Wed
8/5
21°/14°
0%
Thu
8/6
23°/15°
2%
Fri
8/7
25°/18°
19%
Sat
8/8
20°/14°
45%
Sun
8/9
16°/14°
33%
Tips
Payment
Some cafes and rental services may only accept cash; please carry Japanese Yen.
Language
Basic English assistance is available at major tourist facilities and rest houses.
Reservations
No reservation is needed for observatories, but check ahead for seasonal activities like snowshoe rentals.
Clothing
Temperatures drop significantly; bring heavy clothing for winter or bad weather.
Photography
Photography is permitted at observatories; please respect nature conservation rules.
Accessibility
The First Observatory (Kamui Terrace) is designed to be barrier-free.
Etiquette
As this is a protected area of a National Park, please help preserve the natural environment.