Introduction to Lake Baikal: Lake Baikal is the oldest, clearest, and deepest lake in the world. It is also known as the "Well of the World". It is not only rich in water, but also of high quality and can be drank directly. Lake Baikal has enough water to drink for 5 billion people for half a century. If a drop of water is not added to its basin, the Angara River, the only river originating from Lake Baikal, will take 400 years to drain all the water here; if Lake Baikal dries up completely, even if all the rivers in the world flow into Baikal without exception The lake also takes more than 300 days to fill.