evidence: The Yalu River originates from the southern foot of Tianchi Rouge Peak in Changbai Mountain. It flows from northeast to southwest and spans the two provinces of Jilin and Liaoning. The main waterway of the Yalu River is the coexistence of three waterways in the east, middle and west. The lower reaches of the Yalu River are divided into three branches into the sea. It controls the Western Waterway near China. [...] Of course, part of it is due to nature. The Yalu River is a mountain stream estuary with strong tidal characteristics. It has the characteristics of "strong tides and rapid flows". Because of the large amount of sediment, it is a river that is extremely easy to form sandbars and islands. In addition, Due to the role of natural climate in it, the islands on the Yalu River have become more and more numerous and larger. [...] After all, the Western Waterway is China's only outlet to the sea along the Chinese coastline through Chinese territory. If the Western Waterway is not dredged and opened immediately, China will have to pass through North Korea's territorial waters if it wants to enter and exit the Yalu River in the future. This will definitely jeopardize the navigation safety of Chinese ships. It will also increase unnecessary disputes.