what part of my comment indicated that i thought africa was extreme or that geography was the only factor?   explain what i don't understand then.   the greeks did use rivers since they were available, but what my comment was meant to suggest was that even if the greeks hadn't arisen in greece, they'd have succeeded in another location including africa. navigable rivers or no. and by the way - "navigable" rivers do exist in africa, maybe a large renaissance era ship can't sail it but the smaller ships of the ancient era could have.
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