Suoxi Valley is the center of Wulingyuan scenic zone. It covers an area of more than 180 square kilometers and is the largest of the three zones. Landform here is the same as Zhangjiajie and Mountain Tianzi, mainly making up of sandstone peaks. However, in the east, there is a collection of caves, for example, Yellow Dragon Cave and Goddess Cave. These are caves made of limestone. In terms of rare animals, Suoxi Valley boasts more than 20 species, such as leopards, pangolins, and giant salamanders. There are more than 20 groups of rhesus monkeys with their total number reaching to 1,000. According to scientific statistics, trees here have 93 families, 208 genus, and 679 species in all. Among them, those that are under national special protection reach to 19 species. Wild medicinal herbs are extraordinarily rich. There are 500 species in all.