Natural landmarks are significant features of the Earth's landscape that have been formed by natural processes. These can include mountains, rivers, cliffs, and unique rock formations. They often serve as important points of reference for navigation and are frequently visited for their beauty and recreational opportunities. Many natural landmarks are also protected areas, such as national parks, to preserve their ecological and geological significance. Examples include the Grand Canyon in the United States and Uluru in Australia. These sites attract millions of visitors each year, offering opportunities for hiking, photography, and learning about the environment.