Coverage stretches from the Afon Dwyfawr valley and Treflys eastward to Pen y Bedw, and from Snowdon southward to Porthmadog. Tremadoc and Blaenau Ffestiniog are the other towns shown. Several railways are shown winding among the mountains, including the Croesor Tramway, Festiniog Railway, Bala & Ffestiniog Railway, Conwy Valley line, North Wales Narrow Gauge Rly.