Terrain refers to the physical features or characteristics of an area, including its relief (elevation or slope), landforms (such as mountains, plateaus), bodies of water (rivers, lakes), vegetation cover (forests, deserts), etc. It describes the natural surface attributes that impact movement or other activities in a given location.
Related terms
Physical Geography: The branch of geography that deals with the study of natural features and processes on Earth's surface.
Landforms: Natural features of the Earth's surface, such as mountains, valleys, plains, hills, etc.
Elevation: The height above or below a fixed reference point (usually sea level) of a location on Earth's surface.