Lake Shikosu-ko is well-known as Japan’s northernmost ice-free lake, which results from its depth. Surrounded by mountains, it is clearly a jewel of Hokkaido. In the winter, a little corner of Lake Shikotsu’s is converted into an ice village, complete with ice-homes, an ice fort and even an ice cathedral. There are ice slides that children play on and a flat rink for sliding around on. Really impressed with the size and beauty of the structures as the shimmered in the cold sunshine.