The library shows 21 areas (municipalities)
However there seem to be 25.
https://en.wikipedia.org/wiki/Municipalities_of_Montenegro
There is the new Zeta municipality, created in 2022, divided from Podgorica Municipality:
https://en.wikipedia.org/wiki/Zeta_Municipality
In addition - you have the area marked "Skadar Lake" (which is a lake and not a region...). Is it meant to be like this?
<3