1952 Aer Lingus C-47 accident

Yr Arddu is a mountain summit found in the Moelwynion in Snowdonia; grid reference SH673507. The height of the summit above sea level is 589 meters (1932 ft). The height was measured and confirmed on March 10, 2007. This summit should not be confused with Yr Arddu (South).

The Moelwynion (a Welsh plural, sometimes anglicised to Moelwyns) are a group of mountains in central Snowdonia. They extend from the north-east of Porthmadog to Moel Siabod, the highest of the group. The name derives from the names of two of the largest mountains in the group, Moelwyn Mawr (great white hill) and Moelwyn Bach (little white hill), 770m and 710m, respectively. Moel Siabod, to the north, is the highest at 872m. The group includes the following summits: Moel Siabod Moelwyn Mawr Moelwyn Bach Allt-fawr Cnicht Craigysgafn Cnicht North Top Moel Druman Ysgafell Wen Ysgafell Wen North Top Manod Mawr Manod Mawr North Top Ysgafell Wen Far North Top Moel-yr-hydd Moelwyn Mawr North Ridge Top Moel Penamnen Moel Meirch Y Ro Wen

Cwm Dyli is the location of a hydro-electric power station on the southern flank of the Snowdon range in North Wales. At the time it was built, it was the largest hydro-electric power station in the United Kingdom. It is Britain's oldest power station, and is believed to be one of the oldest Grid-connected hydro-electric stations in the world.

The mediaeval Welsh cantref of Arfon in north-west Wales was the core of the Kingdom of Gwynedd. Later it was included in the new county of Caernarfonshire, together with Llŷn and Arllechwedd under the terms of the Statute of Rhuddlan in 1284. The island of Anglesey faced it across the Menai Strait; to the east was the cantref of Arllechwedd, to the south the cantref of Eifionydd (which, together with Ardudwy, was part of the earlier kingdom of Dunoding), and to the west was the cantref of Llŷn. As the name suggests, Arfon faces Anglesey (Môn) (see soft mutation) across the Menai, and controls access to that strategic strait which has played an important part in Welsh history. Broadly speaking, it stretched from the peaks of Yr Eifl in the west to Afon Cegin, a stream just east of Bangor, and inland from the shores of the Menai southwards into the heart of Snowdonia (Eryri), including Dyffryn Nantlle and the strategic Llanberis Pass. In geographical terms, the cantref was very variable, including fertile land and rich pastures on the shore of the Menai and in the valleys, a number of woods on the slopes and mountains to the south, and the highest mountains in Wales such as Snowdon and Tryfan. Arfon comprised two commotes, which were apparently created later in its history: Arfon Is Gwyrfai and Arfon Uwch Gwyrfai, whose boundary was the Gwyrfai River. During the Iron Age and the Roman era, it was part of the territory of the Ordovices. The Roman fort of Segontium and the Dinorwig hill fort were located there. The main defensive fortress in the era of the Welsh princes was Dolbadarn Castle, near modern Llanberis. Important ecclesiastical centres were to be found in Bangor and Clynnog Fawr. The bishops of Bangor, the successors of St Deiniol, had an extensive holding of land in the north-east of the cantref. This was known as Maenol Bangor, but its status as an administrative unit within Arfon is uncertain. Clynnog owned broad lands in Llŷn and Anglesey. Arfon features prominently in Welsh mythology, particularly in the Fourth Branch of the Mabinogi. Math fab Mathonwy's court at Caer Dathyl was located there, as was Aranrhod's at Caer Aranrhod. The battle between the forces of Math and Pryderi took place in Arfon. Lleu Llaw Gyffes flies to Nantlleu in Arfon in the form of an eagle after his attempted murder by Gronw Pebr.A local government district of the same name existed from 1974 to 1996, when Gwynedd became a unitary authority. The name Arfon itself is still used for the area, as it has been for centuries in Wales.

The Borough of Arfon was local government district with borough status from 1974 to 1996, being one of five districts in the county of Gwynedd, north-west Wales.

Pen-y-Gwryd is a pass at the head of Nantygwryd and Nant Cynnyd rivers close to the foot of Snowdon in Gwynedd, Wales. The area is located at the junction of the A4086 from Capel Curig to Llanberis and Caernarfon and the A498 from Beddgelert and Nant Gwynant about a mile from the head of the Llanberis Pass. It is close to the boundary with Conwy county borough in northern Snowdonia. The famous mountaineering hostelry, Pen-y-Gwryd Hotel, is located in the pass. It is also a mountain rescue post with links to the other rescue posts at Ogwen Cottage and Plas y Brenin. The Old Miners' Track from the Snowdon copper mines are now part of the modern A4086 road between Pen-y-Gwryd and Pen-y-Pass. It continues northwards beyond Pen-y-Gwryd skirting Glyder Fach to Bwlch Tryfan and Dyffryn Ogwen. From Pen-y-Pass is the "PYG track", one of the many routes leading to the summit of Snowdon, its name is believed be derived from the initials ("P-y-G"). However, older maps show it as the "Pig track", a name derived from Bwlch y Moch (the Pigs' Gap).

The Nant y Cynnyd is a small river in Gwynedd, north Wales, starting near the Pen-y-Gwryd hotel near Capel Curig. The Ordnance Survey map is not completely specific, but the river grows into Afon Glaslyn and into Llyn Gwynant.

Ysgafell Wen is a subsidiary summit of Allt-fawr in Snowdonia, North Wales. It is the highest point on a broad ridge that stretches to the north-west of Moel Druman, and includes two other summits, Ysgafell Wen North Top. and Ysgafell Wen Far North Top.

Ysgafell Wen Far North Top is a top of Ysgafell Wen North Top in Snowdonia, North Wales. It lies directly to the west of Ysgafell Wen North Top, and rises as a rocky outcrop from one of the dog lakes, Llynnau'r Cwn.

Ysgafell Wen North Top is a peak on a ridge in Snowdonia, North Wales. It lies to the north of the highest summit on the ridge Ysgafell Wen. It is a subsidiary summit of Allt-fawr. The summit is located at the edge of Cwm Edno, an edge that falls steeply into the cwm. Small lakes surround the summit, known as Llynnau'r Cwn (the dog lakes). To the west lies the peak's top, known as Ysgafell Wen Far North Top.

Gallt y Wenallt is a subsidiary summit of Y Lliwedd in Snowdonia National Park, north Wales. It lies at the end of the north ridge. Its northern face is reputed to be the longest slope in Snowdonia, being close to 2000 ft. It is also the last nail in the "completist's" Snowdon Horseshoe. The summit is grassy and is marked with a small cairn. In clear visibility, the view down to Llyn Gwynant is regarded as one of the finest in Snowdonia.It is the resting place of famous oil man and sailor, Emrys Nye Hughes.

Moel Druman is a mountain in Snowdonia, North Wales and forms part of the Moelwynion. It is a subsidiary summit of Allt-fawr.