Hill data: The Database of British and Irish Hills v18.6 (CC BY 4.0)Height635 m2,083 ft
Grid RefSN 77747 20331
OS MapOL12OS Explorer
AreaBrecon Beacons
Two huge prehistoric cairns, Carnau'r Garreg Las, stand on the summit of Garreg Las, and the more northerly one marks the highest point. Also known as Twyn Swnd, it is a 635 m subsidiary summit of Fan Brycheiniog, sitting towards the northern end of the broad ridge of Esgair Hir. The Beacons Way continues southwards over the hill.
New to the Pennants?Read our guide: What Are The Welsh Pennants?Rock & Ground
It is built of coarse Twrch Sandstone, with a band of limestone karst around its northern and western flanks and major shakeholes on its eastern side.
Summit Weather
Our Route
Distance7.6 mi12.2 km
Ascent660 m2,170 ft
Time4h 10mwalking
StartSN 7999 2381Grid reference of the start
DirectionsSafety: Routes are a guide only. Carry a map and compass and know how to use them, check the weather before you go, and turn back if in doubt. You use this route at your own risk.
