Wetland introduction: Wetland landforms include wetland plains, coastal beaches, estuary deltas, underwater deltas, etc. There are dense rivers in the interior, and there are 7 larger rivers, mainly the Yalu River, Dayang River, and Shaba River. , Longtai River, Zaoer River, Yilong River and Xiaoyang River, all of which eventually flow into the Yellow Sea.