Kingdom Size


"The map is divided into max. 100 kingdoms, each about 100x100 squares in size. Every kingdom has its own name and also its own ranking. All kingdoms are separated by rivers, that's how you can distinguish them on the map."

The wiki says rivers separate the kingdoms. but the area that the rivers separate is much larger then 100x100.
Based on the kingdom ranking, I can tell that a kingdom is about 20 provinces in size. is that correct?