Hydrogeochemistry of Fluorine in Groundwater in Humid Mountainous Areas: A Case Study at Xingguo County, Southern China

Figure 2

Sampling locations of groundwater in Northwest Xingguo County. 1: Sinian fissured water-bearing formation of metamorphic rock; 2: Cambrian fissured water-bearing formation of metamorphic rock; 3: Devonian porous-fissured water-bearing formation of clastic rock; 4: carboniferous porous-fissured water-bearing formation of clastic rock; 5: Jurassic fissured water-bearing formation of granite; 6: code of groundwater system; 7: boundary of fifth-scale groundwater subsystem; 8: surface water system; 9: sampling location; 10: village; 11: peak; and 12: groundwater flow direction.