Lake Kussharo is a caldera lake located in Hokkaido, Japan. It is known for its stunning natural beauty and is surrounded by mountains and forests. The lake is part of the Kushiro Shitsugen National Park and is the largest volcanic lake in Japan by surface area. The lake has a unique feature: it is home to several hot springs, which create warm areas on its surface even in winter. Lake Kussharo is popular for various outdoor activities, including hiking, birdwatching, and fishing, attracting nature lovers and tourists year-round.