1. The Colorado Plateau:
* Area: ~130,000 square miles (336,600 square km)
* Formation: This plateau was formed by the uplift of the Rocky Mountains. The Colorado River and its tributaries carved the spectacular canyons, mesas, and buttes we see today.
* Notable features: Grand Canyon, Zion National Park, Bryce Canyon National Park.
2. The Columbia Plateau:
* Area: ~120,000 square miles (310,800 square km)
* Formation: This plateau was formed by massive volcanic eruptions that deposited vast amounts of basalt lava over millions of years.
* Notable features: Mount St. Helens, Mount Hood, the Snake River.
So, which is bigger?
While the Colorado Plateau is slightly larger in area, it's worth noting that the Columbia Plateau includes large areas of volcanic features that might not fit the strict definition of a plateau.
Ultimately, the "biggest" plateau in the US depends on your definition and what criteria you prioritize. Both the Colorado and Columbia Plateaus are incredibly impressive geological formations with unique features that deserve recognition.
