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. 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.
By elevation Yr Allt Fawr is
# 62 out of 731 in Gwynedd
By prominence Yr Allt Fawr is
# 51 out of 3092 in the Wales Mountains # 25 out of 731 in Gwynedd # 51 out of 3083 in Wales
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