Russian national park

I am going to write about the largest freshwater lake in the world, containing 20 per cent of the world's unfrozen surface fresh water. It is also the clearest and the oldest lake in the world. It is in the south of the Russian Sib region Si is a rift valley. There are 60 fish species.The Baikal area has a long history of human habitation. The lake have its own nickname (The Pearl of Siberia).