Trefor is a village on the northern coast of the Llŷn Peninsula, in Gwynedd, Wales. It had a population of 1,067 at the 2021 Census. Trefor is in the Community of Llanaelhaearn, and Llithfaen is nearby. There is a beach in Trefor and also a shop in the village centre. It was in the historic county of Caernarfonshire. Location and amenities Trefor is 9 miles (14 km) north of Pwllheli and south of Caernarfon. It is surrounded by the sea and mountains, overlooking Caernarfon Bay. Just off the main A499 road, Trefor has a small harbour and a beach with some sand. At the top of the beach is an emergency telephone to summon help in the event of a maritime emergency. The land behind the beach is made of boulder clay deposited during the last glaciation, and is being slowly eroded by the sea. Because of this land erosion, a large expanse of clay is exposed when the tide is out which is dangerous to walk on. Rising steeply behind the village is Yr Eifl, a range of three hills that dominate the skyline. A granite quarry, known to the locals as Y Gwaith Mawr ("the large works"), Trefor Granite Quarry or the Yr Eifl Quarry, opened in 1850. The industrial narrow-gauge railway—Trefor Quarry railway—opened in 1865 and brought mined and refined rock from the quarry to the pier on the coast. From here it was transported via a conveyor belt onto ships, but the railway was gradually replaced by road transport. Large-scale industry ended with its closure in 1960, after which began the clean up: many of the buildings were demolished, rubble was either discarded beside the roads or/and buried, and the majority of the rail tracks were removed and reused as fence and gate posts, which can still be seen around the village. The rare properties of the granite within the quarry made it the perfect material to produce curling stones for the winter Olympics. Trefor is one of only two locations where this particular granite is found (the other being Ailsa Craig in Scotland). Tre'r Ceiri, the second highest of the hills, has one of the best examples of a Stone Age or Neolithic settlement in Europe on its summit. Views from the summits, on a clear day, extend to Ireland, the whole of Cardigan Bay, Anglesey, Snowdonia, and the northern mountains of England. The central