The most famous lakes in Shiretoko are the Shiretoko-five lakes. These lakes are located at the foothills of Mount Io (sulphur mountain) which forms part of the mountain range towering along the Shiretoko peninsula. The lakes were formed long ago as a result of Mount Io erupting and spilling lava at its base, which resulted in 5 hollow pools eventually filling with water. The lakes are surrounded by rich primeval forest and on sunny days they turn into mirrors, reflecting the amazing mountain range beyond. This all contributes to make Shiretoko-five lakes one of the most beautiful scenic spots in Shiretoko.