Around the third century BC, the central area of Yunnan around present day Kunming was known as Dian. The Chu general Zhuang Qiao entered the region from the upper Yangtze River and set himself up as "King of Dian". He and his followers brought into Yunnan an influx of Chinese influence, the start of a long history of migration and cultural expansion. Yunnan is the most southwestern province in China , with the Tropic of Cancer running through its southern part. The province has an area of 394,000 square km, 4.1 percent of the nation's total. The province borders Guangxi Zhuang Autonomous Region and Guizhou Province in the east, Sichuan Province in the north, and Tibet Autonomous Region in the northwest. It shares a border of 4,060 km with Myanmar in the west, Laos in the south, and Vietnam in the southeast.
