5 landform regions
Cascade Range
The Cascade Range or Cascades is a major mountain range of western North America, extending from southern British Columbia through Washington and Oregon to Northern California. Wikipedia
Rocky Mountains
The Rocky Mountains stretch some 3,000 miles from British Columbia and Alberta in Canada through Idaho, Montana, Wyoming, Colorado and down to New Mexico in the U.S. The range offers dramatic wilderness, diverse wildlife and alpine lakes. Colorado’s Rocky Mountain National Park is traversed by 300 miles of hiking trails and famously scenic Trail Ridge Road.
Elevation: 14,439'
Area: 382,894 mi²
Highest point: Mount Elbert
Wikipedia
Great Basin
Piedmont
The Piedmont is a plateau region located in the eastern United States between the Atlantic Coastal Plain and the main Appalachian Mountains, stretching from New Jersey in the north to central Alabama in the south. Wikipedia
Appalchain Mountains
The Appalachian Mountains, often called the Appalachians, are a system of mountains in eastern North America. Wikipedia
Elevation: 6,683'
Area: 737,000 mi²
Highest point: Mount Mitchell