The geography of Colorado is diverse, featuring mountains, plains, and deserts. The state is home to the Rocky Mountains, which run north to south and include some of the highest peaks in the contiguous United States, such as Mount Elbert. The eastern part of Colorado consists of vast plains that gradually rise toward the foothills of the Rockies. In addition to mountains and plains, Colorado has several notable rivers, including the Arkansas River and the South Platte River. The state also contains various ecosystems, from alpine tundra to desert landscapes, making it a unique area for both wildlife and outdoor activities.