The Llŷn Peninsula extends 30 miles (48 km) into the Irish Sea from north west Wales, south west of the Isle of Anglesey. It is part of the modern county and historic region of Gwynedd. Much of the eastern part of the peninsula, around Criccieth, is technically[clarification needed] part of Eifionydd rather than Llŷn, although the modern boundaries have become somewhat vague. The area of Llŷn is c. 400 km2, with a population of at least 20,000.
Historically, the peninsula was travelled by pilgrims en route to Bardsey Island (Welsh: Ynys Enlli), and its relative isolation has helped to conserve the Welsh language and culture, for which the locality is now famous. This perceived remoteness from urban life has lent the area an unspoilt image which has made Llŷn a popular destination for both tourists and holiday home owners. Holiday homes remain a bone of contention among locals, many of whom are priced out of the housing market by incomers. From the 1970s to the 1990s, a shadowy group known as Meibion Glyndŵr claimed responsibility for several hundred arson attacks on holiday homes using incendiary devices, some of which took place in Llŷn.