A joke: Why doesn't the Yangtze River stay with any river? Because they are not rivers.

Why don't the Yangtze River and Huangpu River stay together? Because it is not a river, the Huangpu River and the Yangtze River are not a river, and the Huangpu River is the last tributary of the Yangtze River.

Huangpu River flows through Shanghai, dividing Shanghai into Puxi and Pudong. It is an important waterway in Shanghai. After being accepted by Baidu Bridge outside the center of Shanghai, Wusongjiang River joins the Yangtze River at Wusongkou, which is the last tributary of the Yangtze River before it joins the East China Sea.