1. an island and historic county in Gwynedd, in NW Wales.


  1. an island and county of N Wales, formerly part of Gwynedd (1974–96), separated from the mainland by the Menai Strait. Administrative centre: Llangefni. Pop: 59 500 (2003 est). Area: 720 sq km (278 sq miles)Welsh name: Ynys Môn

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