Hunan (湖南) is a landlocked province of the People's Republic of China, part of the South Central China region. Located in the middle reaches of the Yangtze watershed, it borders the province-level divisions of Hubei to the north, Jiangxi to the east, Guangdong and Guangxi to the south, Guizhou to the west and Chongqing to the northwest. 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 by population and the 10th most extensive province by area. Its 2018 nominal GDP was more than 500 billion USD, which is among the top 30th largest sub-national economy in the world with its PPP GDP over 1 trillion USD.