The Menai Strait is a narrow stretch of shallow tidal water about 25 km long, which separates the island of Anglesey from the mainland of Wales. It varies in width from 400 metres from Fort Belan to Abermenai Point to 1,100 metres from Traeth Gwyllt to Caernarfon Castle. It then narrows to 500 metres in the middle reaches and then it broadens again. At Bangor, Garth Pier, it is 900 metres wide.
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Coordinates 53°11'4.763" N -4°13'35.303" E