Six of the world's top 10 natural arches are in Utah. My copy of the Utah Geological Survey's magazine Survey Notes came in the mail today with a feature story on new standards for measuring the size of arches. At 290 feet, Landscape Arch in Arches National Park, is #1.
None of Arizona's arches make the top list but the Natural Arch and Bridge Society has done a magnificent job in compiling the most comprehensive catalog of arches and bridges in the world, with photos, maps, and histories.
NABS lists 28 natural arches in Arizona, two of them unnamed.
[right, Tonto Natural Bridge. Credit Arizona State Parks]