Help with district placement needed

[Trippatonia]

Hi,

I am trying to place an Industrial Zone in the tile NW, NW, W from Cairo but the game doesnt allow me to do so. I am unable to find an explanation for that in Civilopedia or by googling. Anybody able to teach me as to what went wrong?

 

[Browd]

That tooltip says floodplains. Floodplains blocks district placement for everyone except Egypt.

 

[Trippatonia]

Thanks! That's exactly what i needed to know. I could not find this information anywhere else.