Penmaenbach is the most northerly tip of the Snowdonia National Park, which covers a large part of Dwygyfylchi and Capelulo. To the south an arc of hills and uplands extends east to west from Capelulo to Penmaen Mawr, beginning with Yr Allt Wen above Dwygyfylchi, Bwlch Sychnant (the old road crosses this pass to Conwy) and Pen-sychnant at Capelulo. The rounded hill of Foel Lys, Gwddw Glas (Green Gorge), Bryn Derwydd and the head of Cwm Graiglwyd and finally Penmaen-mawr. Foel Lus rises to 362 metres (1188 feet).