A series of nat­ur­al lime­stone bridges in Xian­nAshan Town, Wulong Coun­ty. They lie with­in the Wulong Karst Nation­al Geol­o­gy Park, itself a part of the South Chi­na Karst-Wulong Karst UNESCO World Her­itage Site. In Chi­nese, the bridges are all named after drag­ons, name­ly the Tian­g­long (Sky Drag­on), Qin­g­long (Azure Drag­on) and Hei­long Black Drag­on) bridges.