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Yunnan is known as Yun or Dian for short. It 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, or 4.1 percent of the nation’s total. The province borders the 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.