![]() United States of America: Reader's Digest Association, Inc. Rainbow Bridge, with a span of 234 feet, was relegated to 6thposition. A distant third is Aloba Arch in Chad with a span of about 250 feet. Landscape Arch is the biggest in the world by a mere 3 feet These two great natural wonders stand in a class by themselves. ^ "Giant natural arch found in Afghanistan". At last, in late 2006, the results were inKolob Arch has a span of 287 feet.^ "Feature Detail Report for: Morning Glory Arch"."The Dimensions of Landscape Arch: Removing the Uncertainty". ![]() ![]() ^ "Measurement of Jiangzhou Immortal Bridge"."A tour of the Big 19: Photos and information on the world's giant natural arches". ^ Brandt-Erichsen, David Wilbur, Jay ()."On Measuring Arches: Finding the Span of Arches with Simple Shapes". 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. ^ "The Natural Arch and Bridge Society: About Us".The accuracy is stated as within ☑5 ft (4.57 m). Span measured by Natural Arch and Bridge Society (NABS) in 2010. Sort by clicking on column headings, excepting only the Image and Notes columns. Longest natural arches Īll known natural arches with span lengths of 180 ft (54.9 m) or greater are included in the list. Īs 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. 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).
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