Packages and data
map <- st_union(depmunic) |>
st_sf() |>
nngeo::st_remove_holes()
map
## Simple feature collection with 1 feature and 0 fields
## Geometry type: POLYGON
## Dimension: XY
## Bounding box: xmin: 472365.2 ymin: 4199888 xmax: 481469.4 ymax: 4209186
## Projected CRS: GGRS87 / Greek Grid
## geometry
## 1 POLYGON ((477903 4202529, 4...