Quote:
Originally Posted by David Johnston2
Riverworld wasn't a planet at all. It was a comparatively narrow strip 20 million miles long. The mountains that line the sides of the strip are just there to act as the bars of the crib. The reason why polities are small there is because agriculture and mining are impossible meaning that territorial acquisition is pointless.
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The constant supply of enslaveable people, surplus goods, and luxury goods at each grailstone made territory acquisition canonically gainful.