The dominant landform of the Interior Plains is Plains.

The Interior Plains are characterized by their vast, flat, or gently rolling terrain. This region covers a large part of central North America, including the U.S. Great Plains and Canada's Prairie Provinces. Unlike mountainous regions, the Interior Plains are mostly flat and are well-suited for agriculture, making them one of the most important farming areas on the continent. The plains are interspersed with some river valleys and low hills, but the overall flat landscape is the defining feature of this landform.