Y Felinheli, formerly known in English as Port Dinorwic, is a village, area and electoral ward beside the Menai Strait between Bangor as well as Caernarfon in Gwynedd, north-west Wales. The population of the village was 2,284 at the 2011 Census. Y Felinheli has its beginnings in 2 communities, Tafarngrisiau near St Mary's Church and also Aberpwll to the north-east where there was a mill on the Afon Heulyn. The mill was rebuilt closer to the sea in 1633 and also gave its name to the negotiation. The area was mostly agricultural up until the location was transformed by slate quarrying in the 19th century. A new dock was built in 1828 when lime was drawn out at Brynadda and also slate as well as lime were filled and culm (coal dust or anthracite slack) was generated to terminate the lime kilns. The owners of the Vaynol Estate, the Assheton Smiths, possessed most of the land in Y Felinheli and also developed the Dinorwic Quarry in the late 18th century, They likewise built the harbour to export slate carried to the quay by the Dinorwic Railway, a narrow scale railway that was ultimately replaced by the Padarn Railway. Industrial development gave Y Felinheli (Felin-hely, 1838) the different name Port Dinorwig or Port Dinorwic.