I don't think that is the usual English or Welsh way Wolfgang. As far as I'm concerned the effort is to try to assess the other person's knowledge of an area and give a location that may be recognised. This could be a town, city, county or other region. Sometimes we will "home in" eg. When I lived in a village in Wales, I may have said I lived in North Wales, North West Wales, near Llandudno or even specifically Bryn Pydew. I do similar here but this time using counties Norfolk, North Norfolk, Cromer, Roughton.

One reason for avoiding counties in N Wales was the way they messed about with the names and boundaries. Without moving, I lived in Caernarvonshire, Gwynedd and Conwy. To confuse the issuse, I think Gwynedd still exists but no longer goes further North than around Bangor and Conwy not only contains part of what was Gwynedd but also part of what has been variously Denbishire and Clwyd.