Colorado is renowned for its diverse geographical features and remarkable protected areas. Here's a comprehensive look:

Significant Geographical Features

1. Rocky Mountains: Dominating the landscape, the Rockies offer dramatic peaks and deep valleys. The highest summit is Mount Elbert at 14,440 feet.

2. Great Plains: On the eastern side of Colorado, you'll find vast expanses of the Great Plains, characterized by flat lands and prairies.

3. Colorado Plateau: This region in the western part of the state features mesas, canyons, and high desert landscapes.

4. San Juan Mountains: A sub-range of the Rockies, known for their rugged terrain and mineral-rich lands.

5. Colorado River: Famous for its deep canyons, the river plays a crucial role in supporting the state's ecosystems.

Protected Areas

1. Rocky Mountain National Park: Offers alpine lakes, wildlife, and extensive hiking trails. More details here.

2. Mesa Verde National Park: This park preserves ancient Puebloan cliff dwellings and offers a glimpse into pre-Columbian history.

3. Great Sand Dunes National Park and Preserve: Known for the tallest sand dunes in North America, framed by the Sangre de Cristo Mountains.

4. Black Canyon of the Gunnison National Park: Features steep cliffs and a dramatically carved river canyon.

5. White River National Forest: Home to several ski resorts, it also encompasses beautiful landscapes ideal for hiking and camping.

Conservation and Natural Areas

• Colorado Natural Areas Program: Protects sites with rare plants and unique geological formations. More information is available here.

• Bureau of Land Management's National Conservation Areas: These areas preserve important landscapes and habitats. Details can be viewed here.

For more extensive reading on Colorado's geography and protected sites, you can refer to the Wikipedia page.