Gorllwyn is a subsidiary summit of Drygarn Fawr, located on a remote moorland plateau of the Cambrian Mountains.

The summit is grassy and is surrounded by peat bog.

To the west is Drygarn Fawr, its large cairns making it a very distinctive feature in an otherwise featureless plateau.

Drygarn Fawr is separated from Gorllwyn by the pass of Bwlch y Ddau Faen.

To the east the plateau continues towards Y Gamriw.