Allt-fawr
| Allt-fawr | |||
| Caernarfonshire, Merionethshire | |||
|---|---|---|---|
 Allt Fawr from the Rhosydd quarry | |||
| Range: | Moelwynion | ||
| Summit: | 2,290 ft SH681474 53°0’27"N, 3°58’2"W | ||
Allt-fawr is a mountain in Snowdonia on the border of Caernarfonshire and Merionethshire. It 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]
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