This list of longest natural arches ranks the world's natural arches by the length of their span as defined and measured by the Natural Arch and Bridge Society (NABS).[1][2]
As a disclaimer, the NABS states that the information in this list, and therefore the rankings, may change due to more accurate measurements in the future, changes in span length due to natural forces, and the discovery of previously undocumented arches.[3]
^"The Natural Arch and Bridge Society: About Us". naturalarches.org. Natural Arch and Bridge Society. Retrieved 2017-03-12. 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.
^Wilbur, Jay H. "On Measuring Arches: Finding the Span of Arches with Simple Shapes". naturalarches.org. Natural Arch and Bridge Society. Retrieved 2017-03-12.
^Brandt-Erichsen, David; Wilbur, Jay (2015-10-01). "A tour of the Big 19: Photos and information on the world's giant natural arches". naturalarches.org. Natural Arch and Bridge Society. Retrieved 2017-03-10.
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