Holy Island (, 'the island of (Saint)
Cybi') is an
island on the western side of the larger
Isle of Anglesey,
North Wales, from which it is separated by a narrow, winding channel. It is called "Holy" because of the high concentration of
standing stones,
burial chambers and other religious sites on the small island. The alternative and historic name of the island is
Holyhead Island. According to the
2011 UK Census, the population is 13,659.