Xianren Bridge
Xianren Bridge is a natural arch created by flowing water that has the world's longest recorded span. Carved of limestone karst, the formation bridges Buliu River in northern Guangxi Province, China. Because of its remote location, accessible only by a three-hour rafting trip, it was not discovered until recently and remains relatively obscure. An expedition in October 2010 by the Natural Arch and Bridge Society first measured the bridge's span and found it to be in length.
