Garreg Las is a subsidiary summit of Fan Brycheiniog in the Brecon Beacons National Park (Welsh: Parc Cenedlaethol Bannau Brycheiniog) in Carmarthenshire, southern Wales. Its summit sits towards the northern end of a broad north-south ridge, Esgair Hir ("long ridge"), at 635 metres (2,083 ft) above sea level. The hill is sometimes referred to as Twyn Swnd.
A subsidiary top just over 1 kilometre (0.62 mi) to the north of the main summit is Carreg yr Ogof (meaning "rock of the cave"), whose name reflects its limestone geology. Its top, at 585 metres (1,919 ft) above sea level, is crowned by a trig point.
There's a trail called South Wales Traverse (off piste) leading to the summit. Garreg Las is one of the 9 peaks along the multi-day Beacons Way.
By elevation Garreg Las is
# 43 out of 172 in Brecon Beacons National Park # 4 out of 162 in Carmarthenshire
By prominence Garreg Las is
# 32 out of 172 in Brecon Beacons National Park # 35 out of 162 in Carmarthenshire
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