Double Arch and the Milky Way – Arches National Park – Moab, Utah. Black and White version.
The larger of the natural sandstone arches is 148 feet across, and is one of the largest of the 2000 arches found within the park. The larger of the natural sandstone arches is 148 feet across, and is one of the largest of the 2000 arches found within the park. The geologic Entrada sandstone layer that covers much of the park is ideal for creating natural arches over thousands and millions of years, through a combination of wind and water erosion, as well as the seasonal freeze and thaw cycle.