The Interior Plains are located in the central part of North America, stretching from the Arctic Ocean in the north to the Gulf of Mexico in the south. They are bordered by:

* To the east: The Great Lakes and the Appalachian Mountains.

* To the west: The Rocky Mountains.

Here's a more specific breakdown of their location:

* Canada: The Interior Plains extend across most of the Prairie Provinces (Manitoba, Saskatchewan, and Alberta).

* United States: They cover a large portion of the central U.S., including parts of Montana, North Dakota, South Dakota, Nebraska, Kansas, Oklahoma, Texas, and Minnesota.

Key features of the Interior Plains include:

* Vast, flat landscapes: They are characterized by their relatively low elevation and gently rolling hills.

* Rich agricultural land: The fertile soils make the Interior Plains a major agricultural region.

* Important river systems: The Mississippi River and its tributaries flow through the plains.

* Oil and gas resources: There are significant oil and gas deposits in parts of the Interior Plains.

It's worth noting that the term "Interior Plains" is sometimes used in a broader sense to encompass other regions, such as the Great Plains. However, the core area of the Interior Plains is generally considered to be the region described above.