Holyhead Mountain or Mynydd Tŵr
A picture of Holyhead Mountain / Mynydd Tŵr taken from the town's New Park
Elevation:	220 m (722 ft)
Location:	Anglesey,  Wales
Prominence:	220 m
Topo map:	OS Landranger 114
OS grid reference:	SH218829
Listing:	Marilyn
Translation of name:	tower mountain (Welsh)

Holyhead Mountain (Mynydd Tŵr in Welsh) is the highest hill on Holy Island, Anglesey, and the highest in the county of Anglesey, north Wales. It lies about three kilometres west of the town of Holyhead, and slopes steeply down to the Irish Sea on two sides. There is a late Roman watchtower, called Caer y Tŵr (Tower Fortress) on the east side of the hill. View of Holyhead Mountain (Mynydd Twr) from the New Park with Llaingoch in the middle distance below the Mountain. ... A topographical summit is a point on a surface which is higher in elevation than all points immediately adjacent to it. ... The metre is the basic unit of length in the International System of Units (SI: Système International dUnités). ... A foot (plural: feet) is a non-SI unit of distance or length, measuring around a third of a metre. ... [The Isle of] Anglesey or Anglesea (Welsh: [Ynys] Môn, pronounced as U-niss Mawn, in IPA), is an island and county at the north western extremity of North Wales. ... A lovely image of the Welsh flag, derived from an SVG file by Tobias Jakobs in the sodipodi flags collection. ... National motto: Cymru am byth (Welsh: Wales for ever) Waless location within the UK Official languages English(100%), Welsh(20. ... In topography, prominence, also known as autonomous height, relative height or prime factor (in Europe), is a concept used in the categorization of hills and mountains. ... Example of a topographic map with contour lines Topographic maps, also called contour maps, topo maps or topo quads (for quadrangles), are maps that show topography, or land contours, by means of contour lines. ... Image produced from the Ordnance Survey Get-a-map service. ... The British national grid reference system is a system of geographic grid references commonly used in Great Britain, different from using latitude or longitude. ... Peak bagging (also hill bagging, mountain bagging, or among enthusiasts, just bagging) is a popular activity for hillwalkers and mountaineers in which they attempt to reach the summit of each peak in a region above some height, or having a particular feature. ... A Marilyn is a hill with a relative height of at least 150 metres, regardless of absolute height or other merit. ... Welsh redirects here, and this article describes the Welsh language. ... Welsh redirects here, and this article describes the Welsh language. ... Map showing the location of shipwrecks around Holy Island Holy Island (in Welsh, Ynys Cybi, the island of St. ... [The Isle of] Anglesey or Anglesea (Welsh: [Ynys] Môn, pronounced as U-niss Mawn, in IPA), is an island and county at the north western extremity of North Wales. ... National motto: Cymru am byth (Welsh: Wales for ever) Waless location within the UK Official languages English(100%), Welsh(20. ... A panoramic view of Holyhead taken from atop Holyhead Mountain, showing the harbours breakwater on the left Holyhead (Welsh: Caergybi, the fort of St. ... Relief map of the Irish Sea. ... Principal sites in Roman Britain Roman Britain is the term applied to the historical period when Britain was under Roman rule, usually considered AD 44 to 410. ...