Hmmm I'll take a blind guess or two

My initial guess was some sort of US military command division but that doesn't make sense to me with some of the groups (South Africa being seperate from Africa for one).

My next guess was splitting the world into equal population shares but India being grouped with Africa shoots that one down.

It's not a RISK map, linguistic map, political alliance map, or a map of former empires/zones of imperial control

Hmmmm ok I'm stumped, I'll check the comments to see what it is