A terrain is the graph of a continuous function that assigns to every point on the plane an elevation.
a tract or region of the earth's surface considered as a physical feature.
a piece of ground having specific characteristics or military potential; "they decided to attack across the rocky terrain"
Continuos, editable ground, that can have raised or lowered sections by modifying its elevation grid
An area of ground, considered as to its extent and natural features, in relation to its use in a particular operation.
A region of the earthâ€(tm)s surface that is treated as a physical feature or as a type of environment.