Natural arches are geological formations created through the erosion of rock, typically in areas with softer rock layers. Over time, wind, water, and other natural forces wear away the surrounding material, leaving behind a bridge-like structure. These arches can be found in various landscapes, including deserts and coastal regions. Famous examples of natural arches include Arches National Park in Utah, which features over 2,000 such formations. The process of arch formation can take thousands to millions of years, making them significant landmarks in understanding geological history and erosion processes.