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Llyn Cwmorthin 341563.jpg
Allt Fawr from the Rhosydd quarry
Highest point
Elevation698 m (2,290 ft)
Prominence243 m (797 ft)
Parent peakMoelwyn Mawr
ListingMarilyn, Hewitt, Nuttall
Coordinates53°00′27″N 3°58′02″W / 53.00762°N 3.96726°W / 53.00762; -3.96726Coordinates: 53°00′27″N 3°58′02″W / 53.00762°N 3.96726°W / 53.00762; -3.96726
English translationbig slope
Language of nameWelsh
PronunciationWelsh: [ˈaɬt ˈvaur]
Allt-fawr is located in Snowdonia
Parent rangeSnowdonia
OS gridSH681474
Topo mapOS Landranger 115
Listed summits of Allt-fawr
Name Grid ref Height Status
Cnicht 689 m (2,260 ft) Hewitt, Nuttall
Moel Druman 676 m (2,218 ft) Hewitt, Nuttall
Ysgafell Wen 672 m (2,205 ft) Hewitt, Nuttall
Ysgafell Wen North Top 669 m (2,195 ft) Hewitt, Nuttall
Moel Meirch 609 m (1,998 ft) sub Hewitt

Allt-fawr is a mountain in Snowdonia, North Wales and forms part of the Moelwynion group.

It is on the internal border of Snowdonia National Park, and overlooks the town of Blaenau Ffestiniog, with its numerous slate quarries, as well as the Tanygrisiau reservoir and power station.[1] On the northern slope of Allt-fawr is the Oakeley Quarry, the world's largest underground slate mine. On the southern slope is the large Cwmorthin Quarry. These two mines are joined underneath the summit of Allt-fawr and the extensive chambering and adits are visible on the surface of the mountain where underground workings have collapsed.[2]


  1. ^ Nuttall, John & Anne (1999). The Mountains of England & Wales - Volume 1: Wales (2nd edition ed.). Milnthorpe, Cumbria: Cicerone. ISBN 1-85284-304-7.
  2. ^ J.G. Isherwood (1980). Candles to Caplamps: the Story of Gloddfa Ganol. Gloddfa Ganol.

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