Arches National Park is located on the Colorado River 4 miles north of Moab, Utah. The Double Arch is an incredible formation of arches within the Windows area of the park, having the largest concentration of natural arches in the entire world. Double Arch takes its name because it consists of two arches that share the same stone as a foundation for both of their outer legs. Double Arch was formed by downward water erosion from atop the sandstone, rather than from side-to-side water erosion. Arches National Park is known for containing over 2,000 natural sandstone arches, in addition to a variety of unique geological resources and formations.