Seems related to the fact that you can draw a surprisingly-small circle over part of Asia and have more people inside the circle, than out. Human geography is very uneven.
Probably more related to the fact that if you look at the globe from above the Pacific, you see mostly water: https://commons.wikimedia.org/wiki/File:Globe_-_Pacific_Ocea...
Precisely - more than anything else, this article reminded me just how much of our planet is covered by the Pacific Ocean.