How to insert a scale on a map in R

Question

I would like to know if it is possible to generate an equal scale of the attached image, highlighted in red

library(terra)
library(geodata)
brz <- geodata::gadm("Brazil", level=2, path=".")
mun <- brz[brz$NAME_2 == "Castro", ]
plot(mun, main="", axes=FALSE)

Example:

Answer 1

You can use tm_scale_bar from the tmap package to add the scale bar to a map. Additionally, you might need sf to convert mun from SpatVector to sf (a format usable by tmap).

library(tmap)
library(sf)

# Transform mun to sf
tm_shape(sf::st_as_sf(mun)) +
  # Draw as polygon with only borders
  tm_borders() +
  # Add scale bar
  tm_scale_bar(position = c("LEFT", "BOTTOM"))