Its capital and largest city is Changsha, which also abuts the Xiang River. With a population of just over 67 million as of 2014[update] residing in an area of approximately 210,000 km2 (81,000 sq mi), it is China's 7th most populous province and the 10th most extensive province by area. Its 2020 nominal GDP was more than US$600 billion, appearing in the top 30 largest sub-national economies in the world with its PPP GDP being over US$1 trillion.