Natural landmarks are significant features of the Earth's landscape that have been formed by natural processes. These can include mountains, rivers, lakes, and canyons. Examples of well-known natural landmarks are the Grand Canyon in the United States and Mount Everest in the Himalayas. They often attract visitors for their beauty and unique geological formations. These landmarks can also serve as important ecological habitats, supporting diverse plant and animal life. Many natural landmarks are protected as national parks or reserves, helping to preserve their beauty and ecological significance for future generations. Examples include Yellowstone National Park and the Great Barrier Reef.