Karst caves and stone forests feature the wonderful natural ecological environment of Guilin, whose altitude is 140-160 meters. Li River is meandering through Guilin from north to south, with a yearly sand content of 0.067kg/m3 and strong self-cleaning ability. The earth consists of mainly red soils, with PH ranging from 4.5 to 6.5. The plants in Guilin belong to the southern green plants of the sub-tropical evergreen forests, with a variety of 2,329 species, which fall into 247 divisions and 969 sections. There are 1,593 kinds of animals in Guilin, falling into 60 divisions and 295 subdivisions.