Small hills are called hummock's
The ground between two hills is called a valley. A very small one can be called a gully.
An area of hills is called a hill range or hill country.
An area of hills and mountains is called a mountain range.
A land surrounded by mountains and hills is typically called a valley.
A flat land surrounded by hills or mountains is called a valley.
butthead
Small hills of sand made by the wind in a desert are called sand dunes.
tablelands
The hills were called Big Round Top and Little Round Top and are the most famous of the hills at Gettysburg.
Small flat-topped hills found in the Southwest are called mesas. They are geological formations with steep sides and a relatively flat top. Mesas are commonly found in arid and semiarid regions.
The ground between two hills is called a valley. A very small one can be called a gully.
The small hills that overlook Boston Harbor are called the Boston Harbor Islands. These islands include popular destinations such as Spectacle Island and Georges Island, offering scenic views of the harbor and the city skyline.
hillock
Valley. A valley is usually found between two ranges of hills rather than between two hills. The small "valley" between two hills is more properly called a "coll".
An area of hills is called a hill range or hill country.
Abyssal hills are small hills that rise from the abyssal plain, which is the floor of the ocean.
Those hills are called the Black Hills.