I do not know if this has been done before but what about rather than having one river type we have two one that needs a bridge to cross and allows ships to travel up it, and a small stream that can be crossed by any unit and does not allow ships to travel up it.
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I have walked since the dawn of time and were ever I walk, death is sure to follow
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I have walked since the dawn of time and were ever I walk, death is sure to follow
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