The Yellow River valley in China saw the rise of Chinese dynasties at the earliest, while the Indus River valley was home to early Harappan civilization. Both regions are located on the same map. The Cradle of Civille map packs are maps of real world locations designed by Firaxis. In these settings, you can play random leaders or choose leaders appropriate to the past of these areas. Maps can also be opened in the Earth Creator, where you can create specific scenarios. To activate the Mopotamia DLC, you must already have a Civilization 5 game in your Steam membership.