sangzhixianIntroduction：Sangzhi Introduction: Sangzhi County is the hometown of Marshal He Long and the starting point of the Red Army's long march. It is an international tourism new city - Zhangjiajie City, Hunan Province. The county has 3,474 square kilometers and has 28 nationalities and 380,000 people. Sangzhi is a green ocean. It has the first batch of eight major mountain virgin forests in China, the first national nature reserve in Hunan Province. It has been included in China's “Man and Biosphere Reserve (MAB)” and China's “Global Key Biodiversity Areas”. One”, and one of the 200 important ecological zones in the world.