4) a large area where the topography is made up of one landform .
Explanation:
A landform region is recognized as a feature of earth that was formed naturally. The landform regions have common characteristics such as soils, weather or vegetation.
a large area where the topography is made up of one landform is the definition of a landform region. It is not made of multiple, or none. It is made out of one and is a large area.
