Minor Yukari thing

[Andykhang]

It's a fact that Yukari, not only can calculate the width of the Sanzu River, but also it depth as well, despite it's known to be unfathomable.

That got me thinking...calculating the depth is different from calculating the width of the river, as you could essentially "see" the start and end of the river's side by multiple accounts and abit of calculation (also, it's a seeable space in the first place), while I doubt there would be any people going into the depth and gone out to calculate. The prior condition to calculate the depth is to be able to see it, so Yukari would need a really good eye, on top of her boundary perception, to be able to see the depth casually, like Ran said.

Anyway, just want to see if it's applicable.

 

[Udlmaster]

To be honest, it's more likely that she's Supergenius and has that level of intellect rather than perception alone.