Gyrn Ddu

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.

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.

Clynnog Fawr, often simply called "Clynnog", is a village and community on the north coast of Llŷn Peninsula in Gwynedd, north-west Wales. It is in the historic county of Caernarfonshire. The community includes Pant Glas. Clynnog Fawr lies on the A499 road between Caernarfon and Pwllheli, at grid reference SH415500, between the coast and a mountainous area including Bwlch Mawr. It had a population of 130 in 1991, which had increased to 997 at the 2011 Census. The community covers an area of 4,551 hectares (17.57 sq mi). The main feature of the village is the parish church, dedicated to Saint Beuno, which is much larger than would be expected in a village of Clynnog's size. The site is said to be that of a Celtic monastery founded by Beuno in the early 7th century. Clynnog means 'the place of the holly-trees': compare Breton Quelneuc (Kelenneg), Gaelic Cuilneach. In Middle Welsh, its name was Celynnog. It developed into an important foundation and some Welsh law manuscripts specify that the Abbot of Clynnog was entitled to a seat at the court of the king of Gwynedd. The church is recorded as having been burnt in 978 by the Vikings and later burnt again by the Normans. By the end of the 15th century it was a collegiate church, one of only six in Wales. The church was an important stopping place for pilgrims heading for Bardsey Island and contains Cyff Beuno, an ancient wooden chest hollowed out of a single piece of ash and used to keep alms given by the pilgrims. Maen Beuno or "Beuno's Stone" has markings reputed to be those of Beuno's fingers. Outside in the churchyard there is a canonical sundial dated between the late 10th century and the early 12th century. Ffynnon Beuno (St Beuno's Well) is a Grade II* listed structure at the south-west end of the village. The church is a major location on the North Wales Pilgrims Way. The church is open from 10am to 4pm every day. The area has been the site of a number of battles, including the Battle of Bron yr Erw in 1075 when Gruffudd ap Cynan's first bid to become king of Gwynedd was defeated by Trahaearn ap Caradog, and the Battle of Bryn Derwin in 1255 when Llywelyn ap Gruffudd defeated his brothers Owain and Dafydd to become sole ruler of Gwynedd.

St Beuno's Church is a place of worship located in the village of Clynnog Fawr, Gwynedd, Wales. It belongs to the Church in Wales, an Anglican denomination, and is one of six churches in the parish of Beuno Sant Uwch Gwyrfai. It is adjacent to St Beuno's Chapel, to which it is connected, and approximately 322 metres (352 yards) north-east of Ffynnon Beuno (Beuno's Well). Beuno was a seventh-century Welsh abbot who founded a clas on the site of the present church and was later buried there. The church is significant for its architecture and fittings, and has been described by the Royal Commission on the Ancient and Historical Monuments of Wales as "one of the most notable [churches] in North Wales". It is a Grade I listed building.

The 1984 Llŷn Peninsula earthquake struck the Llŷn Peninsula in Gwynedd, northwest Wales on Thursday 19 July 1984 at 06:56 UTC (07:56 BST). Measuring 5.4 on the Richter scale, it is the largest onshore earthquake to occur in the UK since instrumental measurements began.The effects were felt throughout Wales, most of England, and parts of Ireland and Scotland. There were many reports of minor damage to chimneys and masonry throughout Wales and England, the biggest concentration of damage being in Liverpool, which is located around 65 miles northeast of the epicentre. Minor injuries were also reported in the areas surrounding the epicentral area, and rockslides occurred at Tremadog in Gwynedd.The 19 July earthquake was followed by many aftershocks in the following months, the largest measuring 4.3 on the Richter scale, which itself was felt as far away as Dublin, in Ireland.

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.

Trefor is a village on the northern coast of the Llŷn Peninsula, in Gwynedd, Wales. It had a population of 1,067 at the 2021 Census. Trefor is in the Community of Llanaelhaearn, and Llithfaen is nearby. There is a beach in Trefor and also a shop in the village centre. It was in the historic county of Caernarfonshire.

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.

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.

Aberdesach is a small village in a primarily Welsh speaking area of Gwynedd. It is in the historic county of Caernarfonshire. The village is situated approximately 1.5 miles south of the neighbouring village of Pontllyfni and 6 miles south of the county town of Caernarfon.