if you ever get bored, find a worldbuilding community (doesn't matter which kind, can be a forum or reddit or whatever as long as it's got topics) and search "nile" to find the meanest arguments
if someone starts with what seems like a polite question and you can clearly see they've attached an image of the nile delta, that means they're so angry they want to kill someone
Why is this?
in broad strokes, to quickly give a(n admittedly simplified) serious answer,
there's a geographical rule that's usually shortened to "rivers don't fork because rivers erode. when a river temporarily forks, one flow becomes weaker and deposits sediment, which means less water flows through it, which strengthens the other, and this snowballs until it all becomes one flow again" which is basically true, but leaves out enough nuance that people like to bring up bifurcation, confluence, and deltas as exceptions to it
the nile has a lot of things that kinda look like they run counter to that rule, and if someone didn't take the time to explain why deltas seem to fork like that, or why the nile delta is exceptional and interesting among deltas, it'd look like a magic bullet you could drop on the table in bad faith to prove everyone in the room except for you is an idiot (which is why people usually post it)
people draw forked rivers enough that people shorten their critique down to "rivers don't fork" (which is a fair rule of thumb) and people post the nile delta as an attempted gotcha to this often enough that it reliably happens in every single worldbuilding-adjacent community at least once a month
I've never touched this kind of worldbuilding community before but I don't think this would be in bad faith.
If something has happened once, it is an accurate gotcha to someone saying it is unrealistic for someone's world to have it happen.
If I say it's unrealistic for you to posit an entire million-person civilization on the moon, it is NOT in fact a reasonable counterpoint to gesture at the Apollo Program and say "well, we put one person on the moon, so actually my 1990s AU is totally realistic." If you want to use a rare exception to try and defend something, you have to understand the actual details of the exception - there's reasons that the Nile "forks". It is extremely unlikely that those reasons apply to whatever river fork you're trying to justify.
That's a reasonable point if someone brings up Divide Creek, but tons of rivers "fork" at deltas. The better explanation is "deltas are a different phenomenon that inherently require the river flow to be stopping, that mechanism can't create inland forks that continue as rivers" not "the Nile is a super rare one-off event".
Of course, there's also the other big exception (which someone might bring up with a picture of the Nile but from nowhere near the delta), which is active human management. Which matches the Apollo Program in a different way: you can have them, but only in places where a lot of human effort makes world-building sense.
See, this is a good example of an actual rebuttal: it establishes you know the material and have a reason for your exception! And if you do that, I will totally buy that whatever you're doing is reasonable. But I would still maintain that probably in 99% of examples, the shorthand works appropriately - most people making maps do not understand basic 101 things like "rivers don't fork", and getting in to deltas and whatnot is definitely more of a 201 topic. You gotta master the basics first, and you have to actually be able to explain WHY the Nile is a relevant example if you want to use it as a rebuttal.
Putting this as a reblog because it was getting unweildly for a reply.
I am genuinely very confused by this "rivers don't fork" statement? I… live beside a river and our location is at "[river] fork." In another reblog, 'Divide Creek' is brought up as an exception. Do you mean, rivers don't fork INDEFINITELY? Like, they split but one of the offshoots will eventually vanish/go underground and the other will continue as the "main" river..? Or that BIG rivers don't fork, in that, the offshoots are so small in comparison to the main body that they don't even count/show up on maps? Because I. Have just looked up our local river system and those things are splitting like hairs.
So, the pedantic way to put it is "rivers don't fork, they merge." But while the terminology is pedantic, it's pointing at a real geographic fact.
Specifically, what is meant by that is that two rivers can flow downstream into a single larger river, but a single river will not flow downstream into two separate smaller rivers except in special circumstances. What the pedantic world-building forums are doing is calling specifically the second one "forking", but in reality the joining place for the first one (and/or one of the rivers doing the joining) is still often called a fork.
As a world building guide, then, having a place called "[river-name] fork" is perfectly acceptable, but drawing a map depicting a single river flowing downstream into two is fraught. Not wrong necessarily, because the aforementioned special circumstances exist, but fraught.



















