Port Penrhyn Plant Ltd is listed in:
 Ports Docks and Harbours
 Ports Docks and Harbours in Gwynedd
 Ports Docks and Harbours in Bangor

Amlwch Harbour is listed in:
 Ports Docks and Harbours
 Ports Docks and Harbours in Gwynedd
 Ports Docks and Harbours in Amlwch

Caernarfon Harbour Trust (Caernarfon) is listed in:
 Ports Docks and Harbours
 Ports Docks and Harbours in Gwynedd
 Ports Docks and Harbours in Caernarfon

Holyhead Fish Dock is listed in:
 Ports Docks and Harbours
 Ports Docks and Harbours in Gwynedd
 Ports Docks and Harbours in Holyhead