What we see today began forming roughly 65 million years ago, Arches National Park

Arches National Park has the highest concentration of Arches in the world, with roughly 2,000 arches spread over the interior of the park. The largest arch has a span of over 300 feet. The area began as a dry seabed, and the now exposed sandstone was once buried thousands of feet below the surface. Ater many millions of years of geologic folding, uplift and erosion, we have the sandstone rock sculptures of today.