Y Felinheli, formerly known in English as Port Dinorwic, is a village, community as well as selecting ward close to the Menai Strait between Bangor and also Caernarfon in Gwynedd, north-west Wales. The population of the town was 2,284 at the 2011 Census. Y Felinheli has its beginnings in two districts, 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 gave its name to the settlement. The location was largely farming till the location was changed by slate quarrying in the 19th century. A new dock was constructed in 1828 when lime was removed at Brynadda and slate as well as lime were packed as well as culm (coal dirt or anthracite slack) was generated to fire the lime kilns. The proprietors of the Vaynol Estate, the Assheton Smiths, possessed the majority of the land in Y Felinheli and also established the Dinorwic Quarry in the late 18th century, They also developed the harbour to export slate transported to the quay by the Dinorwic Railway, a slim gauge railway that was ultimately replaced by the Padarn Railway. Industrial development offered Y Felinheli (Felin-hely, 1838) the different name Port Dinorwig or Port Dinorwic.