1. First of all, the Yellow River has been flowing into the Bohai Sea in the Yellow River Estuary and Dongying City, Shandong Province, China for many years.

2. Secondly, at the mouth of the Yellow River, a large amount of sediment brought by the Yellow River from the Loess Plateau reaches the mouth of the Yellow River.

3. Finally, the river flows slowly, and the sediment is gradually deposited for many years, forming the Dongying Yellow River Wetland.