The textbook says that Lake Baikal is the largest and deepest freshwater lake in the world, and the seals in the lake are cute and cute; in the history, the place where Su Wu was shepherding is now the area around Lake Baikal, which was called "North Sea" in ancient times, and was once the land of the Han Dynasty; now It seems that the snow-capped mountains in winter, the blue ice crystal clear, the green trees in summer, the lake blue as a mirror; if Baikal is the pearl of Siberia, then Olekhon Island is the heart of this pearl. So it’s a good place to find blue ice in Olejon Island in winter