Shanghai is located on the southern estuary of the Yangtze River, with the Huangpu River flowing through it. The population of the city proper is the third most populous in the world, with 24.89 million inhabitants in 2021, while the urban area is the most populous in China with 39,300,000 residents. As of 2018, the Greater Shanghai metropolitan area was estimated to produce a gross metropolitan product (nominal) of nearly 9.1 trillion RMB ($1.33 trillion). Shanghai is one of the world's major centres for finance, business and economics, research, science and technology, manufacturing, transportation, tourism, and culture, and the Port of Shanghai is the world's busiest container port.
