What was an upper and a lower region?
What made a region an upper, or superior region, or a lower, or inferior region? Examples: - Upper and Lower Egypt - Upper and Lower Austria - Moesia Superior and Inferior - Upper Volta (now Burkina Faso) and Lower Volta (region in Ghana) I've tried to research this. There doesn't seem to be a correlation with altitude, relative orientation, or size. Maybe it is whether they are up- or down-river, but I'm uncertain about that.