Rainbow Bridge National Monument

Rainbow Bridge National Monument is administered by Glen Canyon National Recreation Area, southern Utah, United States. 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 275ft, but a laser measurement in 2007 has resulted in a span of 234ft. At the top it is 42ft thick and 33ft wide. The bridge, which is of cultural importance to a number of area Native American tribes, has been designated a Traditional Cultural Property by the National Park Service.SizeTwo 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 290ft Rainbow Bridge does indeed stand taller than either of its longer competitors, but it is outdone by Aloba Arch in Chad at 394ft. The world's tallest (though less easily accessible) arch is Töshük Tagh, better known as Shipton's Arch, in China at an estimated 1,200ft. Finally, Xianren Bridge (also known as Fairy Bridge), in Guangxi Province, China, with a span of about 295ft, and a height of the opening of 210ft, appears to be the natural bridge with the largest span in the world.