This is the third book of four volumes providing the most comprehensive coverage of the mountains of the Snowdonia National Park. The Eastern Peaks encompases the Ffestiniog and Moelwynion ranges, magnificent peaks of Welsh slate. East lies the Migneint, a great moorland desert of heather and low craggy tors, and the Arenig mountains declining to the lake at Bala. The Berwyn range of fine heathery ridges stretches from Llangollen to the Tanat Valley at Llangynog.