Most north-easterly mainland county in Wales, UK. Adjacent counties are: to the south Merionethshire, east Denbighshire and across the Menai Strait, Anglesey.

Principal towns include: the Royal county town of Caernarfon, the University and Cathedral city of Bangor, Betws-y-Coed and the seaside resorts of Pwllheli, Criccieth, Porthmadog and Llandudno.