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From Old World Official Wiki
In Old World you will explore the map with Scouts, expand your Nation by founding Cities on City Sites, exploit Harvestable Resources and Luxuries, and recruit armies to exterminate rival Nations and Tribes (or negotiate and trade with them).
The Terrain units more order will have an impact on how far they can move each turn. Hills, Sand, crossing a River, Scrub and Trees all add an extra movement point. Rivers and Roads within owned territory require only 2/3 of a movement point.