nandanxianIntroduction：Nandan Introduction: Nandan County belongs to Hechi City, Guangxi Zhuang Autonomous Region, in the northwest of Guangxi, with a total area of ​​3,916 square kilometers. There are 7 towns and 4 townships, including 23 ethnic groups including Zhuang, Han, Yao, Miao, Maonan, Shui and Sui, with a population of 276,000. Nandan is an important "health throat" in history, an important hub for transportation of Gui, Gan and Sichuan. It is at the intersection of National Highway 210 and Guizhou-Guizhou Railway. Nandan has a long history. Song set up Nandanzhou, Mingfu Nandanzhou, Qingdan Nandan Tuzhou, and the Republic of China changed the state to the county in 7 years. Nandan winter has no severe cold and no summer heat, with an average annual temperature of 16.9 °C. In 2006 and 2007, Nandan won the “Top Ten Counties in Guangxi County Economic Development” for two consecutive years. Nandan is the Guangxi flue-cured tobacco production base, China's tin-zinc production base, “China's long-horned pepper town” and “China's Yaoji Township”. Nandan County is in the slope of the transition from the Yunnan-Guizhou Plateau to the hills in the northwest of Guangxi. The whole terrain is inclined from the northeast to the southwest. The mountains in the area are undulating, with peaks and peaks overlapping, and the altitude is between 600 and 900 meters. In Luofu Village, Luofu Village, the three peaks of Tiger Peak are 1321 meters above sea level, which is the highest point in the county. The Laren River mouth of Dutian Village in Wuyu Township is 205 meters above sea level, which is the lowest point of the county, with a height difference of 1116 meters. The Devonian and Carboniferous strata in the county are fully exposed, and there are various types of fossil layers in the world that are rare in the world. They form a complete and clear Acherus ammonite.