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Llandudno (pronounced /ɬan.'dɪd.nɔ/) is a seaside resort and town on the North Wales coast between Conwy and Colwyn Bay, and at the 2001 census had a population of 20,090 including that of Penrhyn Bay and Penrhynside, which are within the Llandudno Community. The town is just off the North Wales Coast railway line which was opened as the Chester and Holyhead Railway in 1848, became part of the London and North Western Railway in 1859, and part of the London, Midland and Scottish Railway in 1923. Llandudno was specifically built as a mid-Victorian era holiday destination and is served by a branch railway line opened in 1858 from Llandudno Junction with stations at Deganwy and Llandudno.
Llandudno, Queen of the Welsh Resorts, a title first implied as early as 1864 is now the largest seaside resort in Wales, and lies on a flat land between the Welsh mainland and the Great Orme peninsula. Llandudno, historically part of Caernarvonshire, has been in recent years a part of Aberconwy within Gwynedd and from 1996 has been part of Conwy County Borough.
Modern Llandudno takes its name from the ancient parish of Saint Tudno but also encompasses several neighbouring townships and districts including Craig-y-Don, Llanrhos, and Penrhyn Bay. Also nearby is the small town and marina of Deganwy and these last four are in the traditional parish of Llanrhos. The ancient geographical boundaries of the Llandudno area are complex. Although they are on the eastern side of the River Conwy (the natural boundary between Caernarvonshire and Denbeighshire), the ancient parishes of Llandudno, Llanrhos and Llangystennin (which includes Llandudno Junction) were in Caernarvonshire. Today, Deganwy and Llandudno Junction are part of the town community of Conwy even though they are across the river from Conwy and linked to Conwy only by a causeway and a bridge.