* The Great Plains: This is the western part of the Interior Plains, stretching from the Rocky Mountains to the Mississippi River. It is characterized by flat, grassy plains, often with rolling hills.
* The Central Lowlands: This is the eastern part of the Interior Plains, situated between the Mississippi River and the Appalachian Mountains. It is characterized by low-lying plains, often with fertile soils and meandering rivers.
It's important to note that this division is not always strict and there is some overlap and variation in the landscape between the two regions.
