The Llŷn Peninsula (Welsh: Penrhyn Llŷn) extends thirty miles into the Irish sea from North West Wales, Southwest of the island of Anglesey. It is part of the modern county and historic region of Gwynedd. The name Lleyn, is thought to be of Irish origin, and to have the same root — Laighin in modern Irish — as the word Leinster. To English speakers, the area was formerly, and is still occasionally, spelt as the Lleyn Peninsula.
This is frowned upon and is often found with the uglier - on the Lleyn, or on the Llŷn.
If you were looking for more information about the area, check out the Lleyn .co.uk links page - Lleyn .