Denver's state is Colorado, which is an American state located in the Rocky Mountain region of the United States. Colorado is known for its diverse geography, ranging from alpine mountains, arid plains and deserts with huge sand dunes, deep canyons, sandstone and granite rock formations, rivers, lakes, and lush forests. It is the 8th most extensive and 21st most populous state in the country. Colorado is home to many national parks, monuments, and other attractions, making it a popular tourist destination.