1984 Llŷn Peninsula earthquake

The A499 road is the major road of the Llŷn peninsula in North Wales. Its northern terminus is a roundabout with the A487 trunk road between Llanwnda and Llandwrog (53.0948°N 4.2824°W / 53.0948; -4.2824 (A499 road (northern end))). It then runs south-westerly along the northern coast of the peninsula, through Clynnog Fawr then turns inland crossing the peninsula to meet the southern coast at Pwllheli, it then follows that southern coast to terminate at Abersoch (52.8227°N 4.5054°W / 52.8227; -4.5054 (A499 road (southern end))). The total length is 23.4 miles. At no point is it a trunk road, although the Welsh Assembly has considered upgrading its status.

Llanaelhaearn is a village and community on the Llŷn Peninsula in the county of Gwynedd, Wales. The community includes the larger village of Trefor and has a population of 1,067, increasing to 1,117 at the 2011 Census.

Gyrn Ddu is a hill near the northeastern corner of the Llŷn Peninsula in the community of Llanaelhaearn in the county of Gwynedd in North Wales. It forms the western half of a wider upland area, another significant top of which is the 510 m summit of Bwlch Mawr to the east. The distinct northern top of Gyrn Ddu is Gyrn Goch, which attains a height of 492 m. The summit of an eastern top which reaches 491 m is crowned by a prehistoric cairn. To the southwest of Gyrn Ddu is the lower top of Moel Pen-llechog, which reaches a height of 316 m, whilst to the south is the 416 m flat top of Moel Bronmiod.

Y Ffôr is a Welsh village located on the Llŷn Peninsula in the county of Gwynedd.

The ancient Welsh cantref of Llŷn in north-west Wales was part of the kingdom of Gwynedd for much of its history until it was included in the new county of Caernarfonshire, together with Arfon and Arllechwedd under the terms of the Statute of Rhuddlan in 1284. Trahain Goch ap Madoc, died 1325, was described as "of Llŷn".

The Trefor Quarry railway was an industrial, 1 ft 11+1⁄2 in (597 mm) narrow-gauge railway connecting the Trefor granite quarry with the pier at Llanaelhaearn on the Llŷn Peninsula.

Carnguwch is a former civil parish in the Welsh county of Gwynedd. It was abolished in 1934, and incorporated into Pistyll. The parish included 1,179 feet (359 m) high Mynydd Carnguwch.

Llangybi (English: Cybi's Church) is a village and former civil parish in the Eifionydd area of the Welsh county of Gwynedd, near Llanarmon. The parish was abolished in 1934 and divided between Llanystumdwy and Llannor. St Cybi's church is a grade II* building.As well as various menhirs, tumuli and stone circles in the countryside around, the village is particularly noted for a holy well, Ffynnon Gybi (English: St Cybi's Well). According to local tradition the girls who wished to know their lover's intentions would spread their pocket-handkerchiefs on the water of the well, and, if the water pushed the handkerchiefs to the south they knew that everything was right and that their lovers were honest and honourable in their intentions; but, if the water shifted the handkerchiefs northwards, they concluded the contrary. A reference to this is made in severe terms by a modern Welsh poet. "This parish, which derives its name from the dedication of its church to Saint Cybi, an eminent British saint, who flourished towards the close of the sixth century, is pleasantly situated in the south-western portion of the county, and nearly in the centre of the promontory which separates Cardigan bay from the bay of Carnarvon. It is of very considerable extent, and the lands are mostly enclosed and in a good state of cultivation : the surrounding scenery is pleasingly diversified, comprising some fine views of the adjacent country, which abounds with varied and picturesque beauty. At Pontrhyd Goch is a slate quarry, which, however, is worked only on a limited scale, the slates being of rather an inferior quality, and the demand for them confined principally to the immediate neighbour-hood. The road from Carnarvon to Pwllheli passes through the parish.

Llanarmon (English: Garmon's Church) is a small village and former civil parish in the old commote of Eifionydd and Cantref Dunoding in the Welsh county of Gwynedd. The parish was abolished in 1934 and incorporated into Llanystumdwy. The village lies 4 miles (6.4 km) north east of Pwllheli and is close to the village of Llangybi, a holy well and the mountain of Carn Pentrych. A well-preserved 15th-century manor house at Penarth-fawr is maintained by Cadw, and another ancient monument Plas Du (Welsh: Black Place) is a well-preserved, substantial sub-medieval gentry house. It also has important historical associations; it was known as the centre of the Roman Catholic faith in the region and was the home of Thomas Owen, High Sheriff of Caernarfonshire from 1569, who was imprisoned for sheltering missionary priests in the house in 1571. "The village is pleasantly situated in a fertile plain, and the neighbour-hood partakes of the pleasing scenery which prevails in this part of the country. The living is a rectory not in charge, annexed to that of Llangybi, in the archdeaconry of Merioneth, and diocese of Bangor, and in the patronage of the Bishop of Bangor. The church, dedicated to Saint Garmon, is an ancient and spacious structure in good repair : some additional windows have lately been inserted, previously to which alteration the interior was very dark." Samuel Lewis, Topographical Dictionary of Wales (1833)

Tre'r Ceiri (Welsh: [treːr ˈkɛiri]) is a hillfort dating back to the Iron Age. The name means 'town of the giants', from cewri, plural of cawr, 'giant'. The settlement is located 450 metres (1,480 ft) above sea level on the slopes of Yr Eifl, a mountain on the north coast of the Llŷn Peninsula in Gwynedd, north-western Wales. Evidence suggests the settlement was first built around 200 BC, though most of the archaeological finds date from AD 150–400, showing the site continued as a settlement during the Roman occupation.Tre'r Ceiri is one of the most spectacular ancient monuments in Wales. The settlement is surrounded by stone walls that are largely intact, and which reach up to 4 metres (13 ft) in some places. Within the walls are ruins of about 150 stone houses, which would have had turf roofs. During Roman times, it may have housed up to 400 people. Historian John Davies suggests that because the settlement is so far above sea level, the huts served as habitations for summer shepherds who also had winter dwellings in the lowlands.In modern times it was first brought to popular attention by Thomas Pennant in his Tours of Wales. Its location and importance have attracted visitors for years. The hillfort has recently been the site of conservation work and footpath maintenance. An extensive survey was made in 1956.

Bryn Beryl Hospital (Welsh: Ysbyty Bryn Beryl) is a health facility in Pwllheli, Gwynedd, Wales. It is managed by the Betsi Cadwaladr University Health Board.

Bwlch Mawr is a hill near the northeastern corner of the Llŷn Peninsula in the community of Clynnog in the county of Gwynedd in North Wales. Its name is an odd one for a hill, as it means "big pass" in English. It forms the eastern half of a wider upland area, the highest point of which is the 522 m summit of Gyrn Ddu, though it is Bwlch Mawr on which the Ordnance Survey constructed a trig point.