There is a demarcation line between the Bohai Sea and the Yellow Sea. It is located at the tip of the Liaodong Peninsula, extending between the bodies of water. What is extraordinary is that the hues on the two sides are totally different. The Yellow Sea section to the east is dark blue, while that of the Bohai Sea in the west is turbid and slightly yellow. This is because of the natural phenomenon formed by the seabed trench.