It extends approximately from Blaenau Ffestiniog in the north to Tywyn in the south, and includes Harlech, The Rhinogydd,[1] Barmouth and Cadair Idris.
[2] The geological layer structure comprises Cambrian sedimentary, volcanic and intrusive rocks from the lower Paleozoic age[2] approximately 4.5 km thick.
[2] The area contains a wide range of metallic minerals and has been mined for (copper,[4] silver,[4] zinc,[4] manganese,[5] gold[4][6][7]) in the past.
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