In which countries is location sharing available?

[This Google support article](https://support.google.com/maps/answer/7326816) makes it clear that location sharing is not available in all countries. > You may get a warning when you open Location sharing. Common causes include: > > * You're in a country or region where you can’t share your location. Which is the list of countries where location sharing is (isn't) available? I am looking for official sources from Google.