Word forms: plural topographies1. uncountable nounTopography 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.
2. countable noun [usually singular, with poss]The topography of a particular area is its physical shape, including its hills, valleys, and rivers.
The topography of the river's basin has changed significantly since the floods. [+ of]