What is the major port located at the mouth of the yangzi river

The major port located at the mouth of the Yangzi River is the Port of Shanghai.

Explanation:

The Port of Shanghai is both a deep-water port - through the Yangshan Port - and a river port. It is located in the immediate vicinity of Hangzhou Bay between the East China Sea and the Yangzi Jiang, Huangpu and Qiantang Rivers.

Since 2005, it is the largest port in the world by tonnage. In 2010, container traffic reached 29.05 million TEUs, according to the municipal government.

The Port of Shanghai has been operated by the Shanghai International Port Group since 2003. It belongs to the index SSE 50, the stock index of 50 major Chinese companies on the Shanghai Stock Exchange.