The island of Arulco has several types of terrain, ranging from swamps to deserts. Terrain becomes a factor when you want to blend into the surroundings.
There are several types of camouflage that can help your merc hide in plain sight. From the World Map, you can move the mouse over any location to determine the terrain you will encounter.
The other important aspect of terrain is the realistic landscapes that make up countless varieties of natural formations, including hills, valleys, rocky spires, etc. The uneven ground can create great spots of elevated areas for increased line of sight.
Also, natural barriers can be a blessing if used to take cover or force the flow of enemies into your ambush.