In the inland area, the river water cannot be discharged, and it is often parked in the low-lying area of the estuary to form a lake, which belongs to the inland lake and non-drained lake. It is also known as the stop lake. The lake water is discharged by evaporation, and the salt is concentrated, mostly salty lakes and salt lakes. Such as Luobubo in Xinjiang, Qinghai Lake in Qinghai, Juyanhai in Inner Mongolia, etc.