Freshwater fish have multiple, much smaller maps which have no connection to each other.

Not to mention that no fish would have any insight into at least whatever is within visible distance from the shore surface. An accurate version of such a map would highlight an interesting perspective of how humans also lack the ability to perceive, comprehend, or even accept things they either physically or psychologically cannot perceive or do not wish to perceive and accept it.

Are rivers 2d or 1d?