One of the most popular and impressive features of the park, the Double Arch is a pair of massive arches that were formed by erosion of the Navajo sandstone. The arches are located close to each other, hence the name Double Arch. The larger arch has a span of approximately 144 feet and a height of 112 feet at its highest point, making it one of the tallest arches in the park. The smaller arch is also impressive with a span of around 67 feet and a height of 67 feet at its highest point. Both arches were formed through a process of weathering and erosion as rainwater and ice slowly wore away the softer sandstone layers over millions of years.