Natural Arch and Bridge Society

The Natural Arch and Bridge Society (NABS) is an all-volunteer non-profit organization promoting the study, appreciation and preservation of natural arches and bridges. Its international membership includes scientists, educators and authors who are leading the study of natural arches as well as hobbyists who simply enjoy visiting and learning about them.

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Highest natural arch

Tushuk Tash ("Pierced Rock"; aka Shipton's Arch) is a natural arch of conglomerate material located west-northwest of K’ashih in Sinkiang, China. In 2000, an expedition from National Geographic measured the height of the arch to be around 366 m (1,200 ft).