I suggest that one new type of water body is implemented: Rivers. No new mechanics, just flavor. Perhaps a bridge rail if you feel like it. I however suggest the limiting factor of there cannot be more than one river per x number of tiles, and possibly have multiple rivers merge at points if that seems like a good idea.
I think this will add to the value of Factorio because it would give the game's terrain a little more variety and flavor without changing anything major, and I think many players would find rivers not only a strategic benefit due to high defense capability (Unless you make all the water shallow
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