Guida
Lake Kuttara is a beautiful caldera lake located in Shiraoi Town, Hokkaido, characterized by its nearly perfect circular shape with a circumference of approximately 8 km. It is believed to have been formed by the collapse of the summit of the Kuttara volcano about 40,000 years ago. The lake is remarkably deep, with a maximum depth of about 147 meters and an average depth of 104.5 meters. One of its most mysterious features is its ability to maintain a constant water level despite having no significant river inflows or outflows. The water transparency is among the highest in Japan, attracting many nature lovers and photographers.
The name 'Kuttara' is thought to originate from the Ainu language, specifically from 'Kuttarushi-to,' which refers to the lake near Kotanushi. The surrounding area, Kotanushi, also has roots in the Ainu language, meaning a place where certain plants grow. Historically, the ecosystem underwent changes in 1910 when Kokanee salmon (Himemasu) were introduced from Lake Towada and Lake Shikotsu. While the area maintains its pristine natural beauty, it is deeply connected to the local history and the natural environment of the Hokkaido region.
The most iconic spot is the 'Fan-Shaped Observatory' (Sen-gata Tenbodai), which offers a bird's-eye view of the stunningly circular lake surface. From this high vantage point, the scale and clarity of the water are truly awe-inspiring. There are also well-maintained parking areas and walking paths near the lakeside, allowing visitors to get closer to the water's edge. The extreme clarity of the water makes the lake act like a mirror, reflecting the surrounding landscape and creating a tranquil, meditative atmosphere.
Access to the Fan-Shaped Observatory is generally available from late April to late November. Please note that roads are closed during the winter season, so plan your visit accordingly. The best time to visit is between May and September, when the surrounding greenery is lush and vibrant. Visiting during daylight hours is highly recommended to fully appreciate the incredible transparency and the deep blue hues of the water.
During the fishing season (typically for about three months starting in early May), visitors can experience the joy of fishing for Kokanee salmon using rental boats at the lakeside rest house. This offers a unique way to immerse yourself in the silence of nature. However, as the lake is located within a protected National Park area, strict adherence to environmental rules and regulations is required to preserve the delicate ecosystem.
Lake Kuttara is conveniently located near the Noboribetsu Onsen area. It is a popular part of a scenic driving route that includes visiting hot spring resorts and the Noboribetsu Bear Park. Many travelers combine a visit to the lake with a stay in a nearby hot spring hotel to enjoy both the natural scenery and the relaxation of an onsen experience.
While the lakeside and observatory are well-maintained, please stay on the designated paths and avoid entering restricted natural areas. Since temperatures can fluctuate significantly, especially during spring and autumn, it is wise to bring a light jacket or extra layers. Cash is often required for local facilities or nearby services. To protect the environment, swimming, collecting plants or animals, and bringing pets are strictly prohibited. Please respect the local rules to preserve this beautiful natural heritage.