plains
they lived on flat or gently rolling hills
there is nothing
Regions of flat or gently rolling land are called plains. They are usually covered in grass and have small amounts of trees.
The flat of gently rolling land in the central US is called the Great Plains.
A plain?
The region of flat land and gently rolling hills that covers the western half of Ohio is known as the Till Plains or Glaciated Allegheny Plateau.
Flat or gently rolling low land refers to areas with minimal elevation changes and smooth terrain. These types of lands are typically found in plains, valleys, and coastal areas, and are often characterized by their broad expanses and lack of significant natural barriers such as mountains or hills. They may be ideal for agricultural purposes due to their level terrain.
a plain
Central America. It also has the most flat or gently rolling hills as far as the eye can see.
Such areas are called plains. Plains are characterized by their flat or gently rolling terrain and are often found at low elevations. They are typically covered with grasses or shrubs and may be used for agriculture or grazing.
A plateau is a broad and flat or gently rolling area where there are few changes in the landscape.
a broad area of flat or gently rolling land is called a plain.