Now you can generate and download terrain maps for any area in the U.S. using data from the United States Geological Survey collection. Using this tool you can access a vast collection of U.S.G.S. data about the United States. Simply find a place on the map, generate a terrain map and then download it. Start up SimCity and you are ready to develop a city based on realistic terrain.
http://simcity.ea.com/coolstuff/terrain/terrain_01.php
http://simcity.ea.com/coolstuff/terrain/terrain_01.php