I am able to find Admin 0-2 Boundary data from HDX, however, I cannot find a data source for admin3-4 polygon boundaries for Argentina.
Can anyone point me in the correct direction?
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You may want to check the Openstreetmap.org admin boundaries which you can easily download from this nice web site: https://wambachers-osm.website/boundaries/
It is ordered by country, hence easy to navigate. Download is provided in vector formats.