Colorado is a state located in the western region of the United States. It is known for its diverse geography, including the Rocky Mountains, high plains, and desert lands. The state is home to several national parks, including Rocky Mountain National Park and Mesa Verde National Park. Colorado is also known for its outdoor recreational activities, such as skiing, hiking, and mountain biking. The state's capital and largest city is Denver, which is a hub for business, culture, and entertainment. Colorado has a population of approximately 5.8 million people and is the 21st most populous state in the US.