User's Country

[hnahli]

How do i know which country the user registered from, and can i add a country field durring th registration?

[yariplus]

You can attempt to locate them based on their IP, which is stored in the db, but there's no guarantee it will be accurate.

You can add a field to registration using a plugin, no way to do it in core.
https://community.nodebb.org/topic/4524/how-to-add-a-required-field-to-registration/3