As you can see, regional or endangered languages aren't always spoken widely in their national regions. Belarusian, Irish, and Welsh languages were provided as examples.
Sources:
- Belarusian map was created by Aledr ReEs.k and uploaded on Wikimedia
- Irish map that shows the percentage of respondents who spoke Irish *outside* educational purposes, made by SkateTier and distributed on Wikipedia under the Creative Commons Attribution Share Alike 3.0 licence
- Welsh distribution map is distributed by gov. wales