* Vast plains: The Great Plains in the central US are largely flat.

* Mountains: The Rocky Mountains, Appalachian Mountains, and Sierra Nevada are all significant mountain ranges.

* Hills: The Appalachian Plateau, the Ozark Plateau, and the Piedmont region are characterized by rolling hills.

* Valleys: The Mississippi Valley, the San Fernando Valley, and the Shenandoah Valley are all examples of valleys.

* Deserts: The Mojave Desert, the Sonoran Desert, and the Great Basin are all arid and often flat.

* Coastal areas: The Atlantic Coast, the Pacific Coast, and the Gulf Coast have a mix of beaches, cliffs, and marshes.

So, the USA is a very diverse country in terms of topography.