The city's West Lake is its best-known attraction. Hangzhou is classified as a sub-provincial city and forms the core of the Hangzhou metropolitan area, the fourth-largest in China. During the 2010 Chinese census, the metropolitan area held 21.102 million people over an area of 34,585 km2 (13,353 sq mi). Hangzhou prefecture had a registered population of 9,018,000 in 2015. In September 2015, Hangzhou was awarded the 2022 Asian Games. It will be the third Chinese city to play host to the Asian Games after Beijing 1990 and Guangzhou 2010.