Maesglase is a Hewitt of 678.5 m in Gwynedd. All four of its nearest neighbours are higher, up to Aran Fawddwy at 905.6 m.
It sits below Glasgwm, only 4.8 km to the north and 101 m higher. It is one of only four register hills in the Dolgellau to Machynlleth region, with Cadair Idris – Penygadair, Tarren y Gesail and Tarrenhendre. On the Hewitts height ladder it sits between Slieve Snaght (Donegal, B923148) (679 m) and Baugh Fell – Tarn Rigg Hill (678.4 m). Its nearest higher summit, Pen y Brynnfforchog (685.2 m, 2.9 km north), is a listed top not profiled here. It falls on two OS 1:50,000 sheets, 124 and 125.
