Questions & Mysteries What's up with the 10km figure?

#1
# Fishman island is 10 km below sea level.
# Zou is 10 km above sea level.
# Sky islands are 10 km above sea level.
# Red Line is 10 km above sea level.

I think there has to be a relation between the number and why the species hide at that specific distance (Fishmen, minks, Celestial Dragons, King's race, Skypieans).

I don't know if this calls for a separate thread but I made one anyway, lol. What do you guys think? Did the WG have any weapon with the reach of 10km? Or is it just a random number for Oda to just show that the things are extremely up high or below?
 
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