Y gwefannau hyn a all ddarparu gwybodaeth neu gysylltiadau defnyddiol:

Gwefannau sector cyhoeddus

www.holyheadtowncouncil.co.uk
www.holyheadforward.com
www.anglesey.gov.uk
www.wales.gov.uk
www.bbc.co.uk/wales/northwest/sites/holyhead

www.north-wales.police.uk

Gwefannau Sector Cymunedol

www.plascybi.co.uk 
www.morlocommunitiesfirst.com 
www.porthyfelin.com
www.holyheadbreakwater.com
www.stcybi.co.uk

www.holyheadmaritimemuseum.co.uk
www.holyheadroundtable.com

www.holyheadsailingclub.org.uk

Gwefannau sector preifat

www.holcom.co.uk
www.stenaline.com

www.holyheadport.com
www.irishferries.com
www.holyhead.co.uk

Gwefannau annibynnol poblogaidd am Gaergybi

www.holyhead.com

www.sealink-holyhead.com

www.holyhead.org

Gellir canfod gwafannau eraill perthnasol trwy chwilio dan "Caergybi" neu "Holyhead"

Cysylltwch â ni os credwch y dylai eich gwefan gael ei restru yma.