Calculate the offsets (surface areas)

w contains surface areas in km² within Bolivia:

summary(w)

##    Min. 1st Qu.  Median    Mean 3rd Qu.    Max. 
##     0.0     0.0   650.6   553.9  1007.9  1856.8

sum(w)

## [1] 1093862

st_area(map)

## 1093862 [km^2]