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Carnedd Llewelyn
Carnedd Llywelyn.JPG
Highest point
Elevation 1,064 m (3,491 ft)
Prominence 750 m (2,460 ft)
Parent peak Snowdon
Listing Marilyn, Hewitt, Welsh 3000s, council top, Nuttall, Furth
English translation Llywelyn's cairn
Language of name Welsh
Location Gwynedd / Conwy, UK
Parent range Snowdonia
OS grid SH683644
Topo map OS Landranger 115, Explorer OL17
Easiest route Hike
Listed summits of Carnedd Llewelyn
Name Grid ref Height Status
Carnedd Dafydd SH663630 1,044 m (3,425 ft) 3, H, N
Pen yr Ole Wen SH655619 978 m (3,209 ft) 3, H, N
Foel Grach SH688658 976 m (3,202 ft) 3, H, N
Yr Elen SH673651 962 m (3,156 ft) 3, H, N
Foel-fras SH696681 942 m (3,091 ft) 3, H, N
Garnedd Uchaf SH687669 926 m (3,038 ft) 3, H, N
Llwytmor SH689692 849 m (2,785 ft) H, N
Pen yr Helgi Du SH698630 833 m (2,733 ft) H, N
Bera Mawr SH674682 794 m (2,605 ft) H, N
Drum SH708695 770 m (2,530 ft) H, N
Drosgl SH664679 758 m (2,487 ft) H, N

Carnedd Llewelyn, usually spelt Carnedd Llywelyn in Welsh, is a mountain massif in the Carneddau range in Snowdonia, north-west Wales. It is the highest point of the Carneddau and the second highest peak by relative height in Wales, 49th in the British Isles and lies on the border between Gwynedd and Conwy.

Topography and ascent routes

Carnedd Llewelyn lies in the middle of the main north-east to south-west ridge of the Carneddau, between Carnedd Dafydd to the south-west and Foel Grach to the north. A short subsidiary ridge links it to Yr Elen to the north-west. It can be climbed from Gerlan, above Bethesda, taking the path following Afon Llafar then continuing to the summit of Yr Elen before following the short ridge to Carnedd Llewelyn. Another path starts from Helyg on the A5, taking the track to the reservoir then following the slopes above Craig yr Ysfa to the summit. An alternative is to reach it by following the main ridge, either from Pen yr Ole Wen or from Foel-fras.

The summit is a flat, boulder-strewn plateau, similar to several of the other mountains that lie in the southern Carneddau. The cliffs below the ridges are well-known rock climbs, notably Ysgolion Duon (meaning "black ladders") and Craig yr Ysfa. The flat plateau means that during winter and spring, significant accumulations of snow and blizzards occur on frequent occasions. The mountain has also been noted for its long-lying snow patches in recent years, with old snow patches known to survive on its southern gullies well into July. The highest lake in Wales, Llyn Llyffant lies to the lee of the summit of Carnedd Llywelyn.


Carnedd Llywelyn means "Llywelyn's cairn" in Welsh. It is widely believed that Carnedd Llewelyn and the neighbouring Carnedd Dafydd are named after Llywelyn ap Gruffudd and his brother Dafydd ap Gruffudd, the last independent prince of Wales, respectively. An alternative theory is that the twin peaks are named after Llywelyn the Great, an earlier prince of Gwynedd, and his son and successor, Dafydd ap Llywelyn. Other sources cite a combination of the above, i.e. Llywelyn the Great and Dafydd ap Gruffudd.

The spelling of the name is also controversial. Carnedd Llewelyn is the form used by the Ordnance Survey, the mapping agency for Great Britain, and other sources. In Wales the spelling Carnedd Llywelyn predominates (it is used on the website of the Snowdonia National Park Authority, for example); this is also the form preferred by most Welsh writers, among others. Many authoritative works, from other study groups, also use the Welsh form. The Welsh personal name Llywelyn, from which the mountain's name is derived, is always spelt thus in the Welsh language, although the forms Llewelyn and Llewellyn are found in older English-language sources.

Plane crash

On 14 March 1950 a number of Royal Air Force, Avro Lincoln's from No. 230 Operational Conversion Unit RAF took off from RAF Scampton bound for RAF Hemswel, England on an night time cross country exercises. In the early hours of 15 March a controller at RAF Barton Hall instructed three of the Lincoln's to divert to RAF Valley, Anglesey, Wales due to bad weather at RAF Scampton. It was at 2:55 am GMT that one of the Avro Lincoln's (RF511) had gone missing & the other two aircraft landed safely Five minutes later. The wreckage of RF511 was found at 5:20 GMT on Carnedd Llewelyn & confirmed all Six crew had died. The subsequent Court of Inquiry determined that the likely cause of the crash was the pilot error. The crew had turned onto a southeasterly course over Anglesey instead of the reciprocal out to sea. The pilot misheard the instruction to "turn 180 degrees" as "turn 80 degrees resulting in a Controlled flight into terrain.

The wreckage of RF511 remain on mountain; in 2002 a memorial plaque was placed at the crash site.

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