The villages that make up Penmaenmawr are Penmaenan and Pant Yr Afon on the west and Dwygyfylchi and Capelulo on the east. They are on a small coastal plain about in length and half a mile deep facing Conwy Bay and the Irish Sea to the north. The bay is sheltered by the south-east tip of Anglesey and Ynys Seiriol (Puffin Island) to the north-west and the limestone headland of Pen-y-Gogarth (the Great Orme) to the north-east. The sea is shallow here between Traeth Lafan and the Conwy estuary. The beach is extensive, consisting of smooth pebbles and a wide expanse of sand; it was awarded a Blue Flag for five years running.