Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pen y Brynfforchog is subsidiary summit of Glasgwm in North Wales forming part of the Aran range in southern Snowdonia.It is separated from Galsgwm by the pass, Bwlch y Fign. The summit is bare and marked by a few stones. The views to the Dyfi hills: include direct view of the Craig Portas ridge, with Maesglase and Cribin Fawr. Glasgwm is a mountain in North 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.