The sand quality of the Huangcheng Beach in China's fishing village is relatively thin and heavy. People will not sink on it. The quality of the sea water is relatively good in the coastal areas of Jiangsu and Zhejiang, and it is cooler to step on it. Moreover, the beach here also carries a little black mud, which is one of the reasons for the turbid sea water. But precisely because these black mud, containing a lot of minerals and trace elements that are beneficial to human health, come to a natural SPA, such beaches are really rare.