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Caernarfonshire (waliisk: Sir Gaernarfon), uk Caernarvonshire of Carnarvonshire as en traditsionel groofskap uun Wales am det stääd Caernarfon. Grater stääden diar san Bangor, Betws-y-Coed, Conwy, Llandudno, Porthmadog an Pwllheli.
Daalang as Caernarfonshire apdiald tu a principal areas Gwynedd (PA) an Conwy County Borough.