This is a classmate's answer ~
One more thing.
Landlord, the seawater you saw in Zhuhai is yellow ~ no ~ I can only say that the seawater near Zhuhai is yellow.
The water in some small islands in Zhuhai is not yellow ~ because it is far from the Pearl River Estuary or Modaomen Waterway.
Want to see something nice ~ I suggest going to Wailingding Island, Dangan or Miaowan ~
Let's go camping together next time.