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A river can never flow upwards, of course. But if there are multiple squares that the river could flow into, how does the game choose one?

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    I would check all surrounding squares for actual altitude. If you have one at 112 feet and another at 108 feet I would assume the river will flow to the lowest surrounding square. Need to check this myself to see if my assumption is correct.
    – Mark Ripley
    Oct 27, 2016 at 8:23
  • @MarkRipley, this must be the correct answer if confirmed.
    – Be Brave Be Like Ukraine
    Nov 27, 2016 at 4:45
  • I recommend to raise the terrain to maximum level before drilling to aquifer, so as to achieve maximum river length. Drilling on flat surfaces tends to produce short rivers. If I drill on the peak of a mountain, the river direction seems random. If I drill on the side, I agree with @MarkRipley; it seems that they have modelled real life pretty well, and gravity prevails. Note that there are certain terrains/improvements that a river won't flow though - I have never seen one through a borehole.
    – Mawg says reinstate Monica
    May 29, 2018 at 6:12
  • In addition, while you may not drill to aquifer next to an existing river, you can set multiple adjacent former to all drill to aquifer, which is what I do. First, raise a very tall mountain, then let rives cascade down all sides of it.
    – Mawg says reinstate Monica
    Jun 4, 2018 at 15:48

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