Lake Mashu

A beautiful and mysterious lake

Lake Mashu is a mysterious lake surrounded by the pristine nature of Akan-Mashu National Park. The deep blue glow of the lake attracts many visitors. The air is also clean, making it a great place to watch the stars.

Lake Mashu is a caldera lake with a circumference of approximately 20 km and maximum depth of 212 m, and which has one of the highest degree of water clarity in the world. The color of the sky is reflected on the clear lake surface, and the deep, beautiful blue reflection is called "Mashu Blue." While visitors cannot go near to the lake surface, they can use three observation decks to view the blue lake, Kamuishu Island floating in the lake, and Kamuinupuri (Mt. Mashu) towering over the sides of the lake. The lake is shrouded in fog for about 100 days every year, but Lake Mashu remains an incredible sight even in the fog! 

Head to the Mashu No. 1 Observation Deck and prepare yourself for the stunning body of water that lies beneath. The uniqueness of Lake Mashu, considered to be one of the most beautiful lakes in Japan, fittingly comes with its own namesake color: Mashu Blue. While the color does change slightly depending on the time of year, such as the sublime sapphire-tinted water often seen in Winter, you will be amazed all year round. For a different kind of landscape, you can enjoy the lake covered in mist and witness the otherworldly “sea of clouds” phenomenon in the early morning from June to October.

  • * Please note that the text shown on this page includes machine translations.
Nearest airports
New Chitose Airport Sapporo Okadama Airport Hakodate Airport Okushiri Airport Asahikawa Airport Wakkanai Airport Rishiri Airport Okhotsk Monbetsu Airport Memanbetsu Airport Nemuro Nakashibetsu Airport Tancho Kushiro Airport Tokachi Obihiro Airport

General Information

Postal code
〒088-3222 
Address
北海道弟子屈町原野
Telephone Number
015-482-1530(Lake Mashu Rest House)
Car Park
140 spaces, charged
Directions
●By Bus: About 25 minutes from JR Mashu Station to Lake Mashu Observation Deck 1
●By car: About 120 minutes from Doto Expwy Ashoro IC
Website

Lake Mashu (Teshikaga Navi)

* Information on facilities is subject to change. Please check each official website for the latest information.

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