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Rainbow Bridge National Monument
Rainbow Bridge National Monument is administered by Glen Canyon National Recreation Area, southern Utah, USA. Rainbow Bridge is often described as the world's highest natural bridge. The span of Rainbow Bridge was reported in 1974 by the Bureau of Reclamation to be , but a laser measurement in 2007 has resulted in a span of . At the top it is thick and wide.
==Size==
Two other natural arches, Kolob Arch and Landscape Arch, both also in southern Utah, have confirmed spans several meters longer than Rainbow Bridge, but by most definitions of the terms they are considered to be arches rather than bridges. With a height of Rainbow Bridge does indeed stand taller than either of its longer competitors, but it is outdone by Aloba Arch in Chad at . The world's tallest (though less easily accessible) arch is Töshük Tagh, better known as Shipton's Arch, in China at an estimated . Finally, Xianren Bridge (also known as Fairy Bridge), in Guangxi Province, China, with a span of about , and a height of the opening of , appears to be the natural bridge with the largest span in the world.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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