* Cascade Range: This mountain range in the Pacific Northwest is known for its volcanoes, with peaks reaching over 14,000 feet (Mount Rainier being the highest).
* Mojave Desert: This desert in California is generally low-lying, with elevations averaging around 2,000 feet. The highest point is Telescope Peak in the Panamint Range, at 11,049 feet.
* Ozark Plateau: This plateau in Missouri and Arkansas is characterized by hills and valleys, with elevations ranging from around 500 to 2,700 feet.
Therefore, the Cascade Range is the highest in elevation.
