Gothrek. You mean you'd like to take a picture of Italy and use that to create a replica of Italy in real scale within your game?
I'm going to go ahead and suggest that you not try to do that. If you had a number of experienced engineers and artists it is theoretically possible to achieve something like that with satellite images and color coding, but not using a terrain brush, which could never handle the scale you are talking about. You could get heightmap data of hundreds of square kilometers and then import that data via script into chunks of areas procedurally, but again, not advisable, on well let's just say a number of levels. I would just start with trying to make some zones look Mediterranean on your own and then work your way up from there.
Or as a big project for you, find some height map data for a tiny part of Italy, build it in World Machine, then import a few zones from World Machine into the engine.