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British Isles (terminology) - Wkp:
An Euler diagram clarifying the terminology. ██ Geographic-only locations.██ Political entities (may also be geographic terms).

UK comprises GreatBritain & NorthernIreland.
GreatBritain comprises England, Wales (what is represented by the circle containing just these 2? shld that circle be there, Euler?), and Scotland.
GreatBritain is in red, meaning only a geographic term. so, I suppose it is more correct to say UK as the country when mailing.

it is more clearly appropriate that Ireland (as a name for the whole island, comprising NorthernIreland as well as the political entity Ireland) be red.


I was looking up ... Stryd Fawr, Harlech, Gwynned, Cymru
to see what was what of the elements in this address
and I learned:
Cymru = Wales (in Welsh)
in which Gwynned is a 'principal area' in which Harlech is a town on the seaside...

Post town	HARLECH
Postcode district	LL46

Principal area	Gwynedd
Ceremonial county	Gwynedd
Constituent country	Wales
Sovereign state	United Kingdom

no ready definition of Stryd Fawr - perhaps a street?
The Llyn Travel Guide: Stryd Fawr is used instead of High Street