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-COUNT
地形；地貌；地势
The topography of a particular area is its physical shape, including its hills, valleys, and rivers.
例句
The topography of the river's basin has changed significantly since the floods.该河流域的地形自洪水以来发生了显著变化。