Terrain (noun)

1. An area of land, especially with regard to its physical features.
2. The type of ground over which a vehicle, army, or person must travel.

Origin:

Late 18th century: from french, from old french terre "earth, land".

Examples:

1. The terrain of the region is mountainous and heavily forested.
2. The army encountered difficult terrain during their march.
3. The terrain in the desert was flat and featureless.
4. The terrain in the jungle was rough and unforgiving.
5. The vehicle was designed for use on all types of terrain.