Impassable terrain covers those areas of the board that our warriors physically cannot enter as a matter of course, or to which they cannot seek entry without an immediate and probably messy death.
Impassable terrain therefore covers such things as lava fields, deep lakes or chasms. Units cannot voluntarily deploy in, enter, move or cross through impassable terrain – they must go around. Remember that units can flee through impassable terrain, although they will have to taketests if they do so. Impassable terrain has a value of 5.