Maybe the kms in Asia are larger than the ones in Africa. Since the metre is defined as the distance traveled by light in 1/299792458s, one can only conclude that light is slower in Asia. Because it's cold. It makes sense. Light is cold-blooded, maybe? See my next paper in Nature, idk.
Let's see the colder it is the more dense the air is. As we all know the speed of light is measured in a vacuum and the more dense the medium light moves through the slow it gets. So this check out. Just don't drive from Dallol to Yakutsk, your speedometer is going to be way off.