(topographies)
1.
Topography is the study and description of the physical features of an area, for example its hills, valleys, or rivers, or the representation of these features on maps.
N-UNCOUNT
2.
The ~ of a particular area is its physical shape, including its hills, valleys, and rivers.
The ~ of the river’s basin has changed significantly since the floods.
N-COUNT: usu sing, with poss