* North-South: The Interior Plains extend from southern Canada all the way down to Texas in the United States.
* East-West: They stretch from the Rocky Mountains in the west to the Great Lakes and Appalachian Mountains in the east.
Specific Distances:
* Canada: The Canadian Prairies, part of the Interior Plains, cover roughly 1.7 million square kilometers.
* United States: The Great Plains region of the United States covers approximately 1.3 million square kilometers.
Overall: The Interior Plains are a vast and expansive region, covering a significant portion of North America.
