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A Map of the Oligarchies, one of the areas in the Yoon-Suin setting by David McGrogan p. 315
Water pours down from the ice fields and etches river valleys through the hills on its way to the God River below. In these river valleys are the oligarchies: city states whose people mine the resources of the mountains and send them downstream in return for slaves and exotic luxuries. The rulers are impossibly wealthy, and war with each other for sport and amusement.