Guizhou is an inland province in Southwestern China. Its capital and largest city is Guiyang, in the center of the province. Guizhou borders the autonomous region of Guangxi to the south, Yunnan to the west, Sichuan to the northwest, the municipality of Chongqing to the north, and Hunan to the east. Guizhou has a humid subtropical climate. It covers a total area of 176,200 square kilometers and consists of six prefecture-level cities and three autonomous prefectures. The population of Guizhou stands at 38.5 million, ranking 18th among the provinces in China.