Y Llethr is the highest mountain

Mountain

Image:Himalaya_annotated.jpg|thumb|right|The Himalayan mountain range with Mount Everestrect 58 14 160 49 Chomo Lonzorect 200 28 335 52 Makalurect 378 24 566 45 Mount Everestrect 188 581 920 656 Tibetan Plateaurect 250 406 340 427 Rong River...

 in the Rhinogydd range

Rhinogydd

The Rhinogydd are a range of mountains located east of Harlech in North Wales....

 of Snowdonia

Snowdonia

Snowdonia is a region in north Wales and a national park of in area. It was the first to be designated of the three National Parks in Wales, in 1951.-Name and extent:...

, in north Wales

Wales

Wales is a country that is part of the United Kingdom and the island of Great Britain, bordered by England to its east and the Atlantic Ocean and Irish Sea to its west. It has a population of three million, and a total area of 20,779 km²...

. The summit consists of a flat grassy top marked only by a small cairn

Cairn

Cairn is a term used mainly in the English-speaking world for a man-made pile of stones. It comes from the or . Cairns are found all over the world in uplands, on moorland, on mountaintops, near waterways and on sea cliffs, and also in barren desert and tundra areas...

 (artificial cone of stones). The summit

Summit

Summit may refer to:*Summit , the highest point of a mountain, hill, road, or railway.-Locations:United States* Summit, Arizona* Summit, Arkansas* Summit, California** Summit, Butte County, California** Summit, Kern County, California...

 is more in keeping with its southern flanks than its rugged northern approach.

The shortest route to the summit goes from the valley of Cwm Nantcol

Cwm Nantcol

Cwm Nantcol is a valley in the Ardudwy area of the county of Gwynedd in Wales.It lies in the Rhinogydd range of mountains in Snowdonia and carries the Afon Cwmnantcol. At the head of Cwn Nantcol is the Bwlch Drws Ardudwy pass, from where it is possible to negotiate the summits of Rhinog Fawr and...

 in the west, either directly or via Bwlch Drws Ardudwy and over the mountain of Rhinog Fach

Rhinog Fach

Rhinog Fach is a mountain in Snowdonia, North Wales and forms part of the Rhinogydd. Technically, Rhinog Fach is a subsidiary summit of Y Llethr, missing Marilyn status by 3m. Thus making it a sub Marilyn along with Diffwys...

. To the south lies the mountain of Diffwys

Diffwys

Diffwys is a mountain in Snowdonia, North Wales, near Barmouth and forms part of the Rhinogydd. On the north side is an exposure of the Caerdion Syncline. It is technically a subsidiary summit of Y Llethr, missing Marilyn status by 2m. It is therefore like Rhinog Fach a sub Marilyn.The summit has a...

, to the south-east lies the mountain of Y Garn

Y Garn (Rhinogydd)

For other hills of the same name, see Y Garn .Y Garn is a mountain in the southern Snowdonia, Wales, north of Dolgellau. It is an outlier of the Rhinogydd range, rising above the Coed-y-Brenin forest and the Rhaeadr Du waterfalls. An abandoned gold mine lies on its eastern slopes.-References:...

, to the north lies Rhinog Fach and to the west lies the hill of Moelfre

Moelfre (hill)

Moelfre is a hill in Wales on the far western edge of the Snowdonia National Park, 3 miles from the village of Dyffryn Ardudwy, 5 miles from the village of Llanbedr and about 10 miles from the town of Harlech. It forms part of the Rhinogydd range. Moelfre reaches a height of...

.