Every Record Must Fall – An Update on the Largest Arches in the World
By Grant Willis
In the May 2009 issue of Survey Notes, we reported that Landscape Arch in Arches National Park was the natural arch with the largest measured span in the world. This was based on the work of the Natural Arch and Bridge Society (NABS), a small group dedicated to finding, measuring, and classifying natural arches (www.naturalarches.org). However, there are always obscure parts of the world where a larger arch could hide.
Only about a year after NABS posted official measurements of Utah’s Landscape and Kolob Arches, a NABS group traveled into an area of rugged karst topography in southeast China. There, they measured two exceptionally large bridges formed by the dissolution and undercutting of limestone (karsting). Both of these are massive structures deep in the rugged Guangxi Province of southeast China. Fairy Bridge has an incredible span of 400 feet. Jiangzhou Immortal Bridge is less accurately measured at 280 to 340 feet, relegating Landscape Arch to 2nd or 3rd place—for now. Other behemoths could remain hidden in some side canyon of this rugged terrain.
Though Landscape Arch doesn’t have the longest measured span of any type of natural arch, it holds the record for sandstone arches and for “arc-type” arches, and with its thin ribbon of gravity-defying sandstone, many would agree that it is the most awe-inspiring arch in the world.
The May 2009 article generated questions regarding the definitions of “arch” and “bridge.” Some people view “arches” and “bridges” as two separate kinds of features. However, NABS, the only organization that I know of that deals with such matters in a scientifically rigorous way, states that a natural bridge is a type of natural arch, and that when comparing span length, bridges are included with all other types of natural arches.
Top Fourteen Arches in the World 2012 (from Natural Arch and Bridge Society website at www.naturalarches.org). NABS now recognizes 14 arches with spans over 200 feet. Expect this list to change again as searches continue.
|1||Fairy Bridge||meander natural bridge in karsted limestone||Buliu River, Guangxi, China||400 ft|
|2, 3, or 4||Jiangzhou Immortal Bridge||meander natural bridge in karsted limestone||Jiangzhou, Guangxi, China||280–340 ft|
|2 or 3||Landscape Arch||arc natural arch in sandstone||Arches National Park, Utah||290 ft|
|3 or 4||Kolob Arch||alcove natural arch in sandstone||Zion National Park, Utah||287 ft|
|5||Aloba Arch||buttress arch and meander natural bridge in sandstone||Ennedi Range, Chad (Sahara Desert)||250 ft|
|6||Morning Glory Natural Bridge||alcove natural arch in sandstone||Negro Bill Canyon, near Moab, Utah||243 ft|
|7||Gaotun Natural Bridge||waterfall natural bridge in karsted limestone||Bazhou He Scenic Area, Guizhou, China||240 ft|
|8||Rainbow Bridge||meander natural bridge in sandstone||Rainbow Bridge National Monument,
|9||Sipapu Natural Bridge||meander natural bridge in sandstone||Natural Bridges National Monument,
|10||Stevens Arch||shelter arch in sandstone||Escalante River, Utah||220 ft|
|11||Shiptons Arch (Tushuk Tash)||? in conglomerate||Near Kashgar, Xinjiang, China||214 ft|
|12||Hazarchishma Natural Bridge||meander natural bridge in karsted limestone||Bamyan Province, Afghanistan||211 ft|
|13||Outlaw Arch||alcove arch in sandstone||Dinosaur National Monument, Colorado||206 ft|
|14||Snake Bridge||meander natural bridge or alcove arch in sandstone||Sanostee, New Mexico||204 ft|
Survey Notes, v. 44 no. 1, January 2012