Shikotsuko

Shikotsuko is a caldera lake located in Shikotsu-Toya National Park in Hokkaido, Japan. It is the second largest lake in Japan by surface area and the twelfth largest overall. The lake is known for its exceptionally clear water, with visibility often exceeding 20 meters. Its depth averages 131 meters, and its deepest point reaches 363 meters. The water temperature remains cool year-round, rarely rising above 20 degrees Celsius.

Shikotsuko was formed by volcanic activity approximately 100,000 years ago. The surrounding mountains, including Mount Shikotsu, are part of the Shikotsu-Toya Caldera. The lake's surface is often covered in mist, contributing to its mystique. Despite its volcanic origins, the lake is not hot spring fed, which is unusual for caldera lakes in the region.

The lake is a popular tourist destination, offering activities such as boating, fishing, and hiking around its shores. The area surrounding Shikotsuko is also known for its natural beauty, with forests and hot spring resorts. Various species of fish inhabit the lake, including the Shikotsuko tsuchifuki, a unique subspecies of carp. The clear waters and scenic landscape make it a significant natural asset of Hokkaido.