I will try to explain it without lots of words! :D
There are two types of money income you get from conquering the map: territory and bonus.
Territory is the income you get from single territories. You can click on any territory and look their income. Some give just no income, others give small amount and there are "big chunks" which generate a lot.
Bonuses are those groups of combined territories under circle/square/hexagon object with number of money/second inside it. I have never seen territory gain was higher than bonuses on any map, it is pretty low compared to income from bonuses.
Here is a screenshot for tl;dr explanation :DDhttps://i.imgur.com/rmsqRiC.png