Priffordd yn Ynys Môn yw'r A4080.
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Enghraifft o'r canlynol | ffordd dosbarth A ![]() |
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Rhanbarth | Ynys Môn ![]() |
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Mae'n ymestyn fel hanner cylch drwy ochr de-orllewinol yr ynys, gan redeg o'r A5 yn Llanfairpwllgwyngyll trwy Niwbwrch, Aberffraw a Rhosneigr, ac ail-ymuno a'r A5 yn agos at Bryngwran.
![Thumb](http://upload.wikimedia.org/wikipedia/commons/thumb/b/b6/A_4080_road_outside_Newborough_-_geograph.org.uk_-_169089.jpg/320px-A_4080_road_outside_Newborough_-_geograph.org.uk_-_169089.jpg)
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