"This field is used to state the location of where the mission will take place, to give advice of the cultural and enviromental factors involved in the mission; as you can guess, a mission in the Sahara desert is going to be really different from one in the Anthartic. Note, however, that, since events tend to get a strange bent sometimes, you could be forced to move outside the mission area in order to accomplish your goal (like, say, following your target in a trip from Scotland to Greece), but usually this info should be rather complete about the circumstances of the mission, so you can usually trust it"