Glasgwm is a mountain in Gwynedd, Wales forming part of the Aran range in southern Snowdonia. It is one of the three Marilyns that make up the range, the others being Aran Fawddwy and Esgeiriau Gwynion. To the west is Maesglase and the Dyfi hills, while to the south-west lies Cadair Idris. To the south lies the Plynlimon range. It is 779 metres (2,556 ft) high.[1]

The head of Cwm Cywarch - - 547375.jpg
Craig Cywarch, the southern face of Glasgwm
Highest point
Elevation779 m (2,556 ft)
Prominence215 m (705 ft)
Parent peakAran Fawddwy
ListingMarilyn, Hewitt, Nuttall
LocationGwynedd, Wales
Parent rangeSnowdonia
OS gridSH836194
Topo mapOS Landranger 124
Listed summits of Glasgwm
Name Grid ref Height Status
Pen y Brynfforchog SH817179 685 metres (2,247 ft) Hewitt, Nuttall
Y Gribin SH843177 600 metres (1,969 ft) sub Hewitt

Craig Cywarch makes up the south face of Glasgwm. Its crags are very popular with rock climbers. A mountaineering club hut is found at the foot of the cliffs.

Glasgwm's summit sits on a large rocky knoll marked by a cairn. The high altitude lake of Llyn y Fign lies adjacent to the summit, and is one of the largest bodies of water adjacent to a 700m+ summit in England and Wales.[2]


  1. ^ Crocker, Chris; Graham Jackson. "Mountaineering & Rock Climbing in the UK: Glasgwm". Database of British Hills. Mountain Archived from the original on 19 July 2011. Retrieved 8 April 2008.
  2. ^ Nuttall, John & Anne (1999). The Mountains of England & Wales - Volume 1: Wales (2nd edition ed.). Milnthorpe, Cumbria: Cicerone. ISBN 1-85284-304-7.