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 275 feet , but a measurement of span according to definition by the Natural Arch and Bridge Society in 2007 resulted in a value of 234 feet . At the top it is 42 feet thick and 33 feet 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.

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 290 feet Rainbow Bridge does indeed stand taller than either of its longer competitors, but it is outdone by Aloba Arch in Chad at 394 feet . The world's tallest arch is Töshük Tagh, better known as Shipton's Arch, in China at an estimated 1,200 feet . Finally, Xianren Bridge , in Guangxi Province, China, with a span of about 295 feet , and a height of the opening of 210 feet , appears to be the natural bridge with the largest span in the world.

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