Hello everyone,
I found this website where you can download open-source, accurate shapefiles of the administrative boundaries of your country (I believe all countries are in there).
https://gadm.org/index.html
If you choose shapefile you will get several files compressed on a zip and each number of group of files indicates one level of administrative boundaries.
For the ones that are working in portuguese cities, I've upload already all levels of administrative boundaries for all the country. You just need to upload the ones of your municipality, companheir@s.
Abraço