From Stamps of the World
Amlwch is the most northerly town in Wales and is a community. It is situated on the north coast of the Isle of Anglesey, on the A5025 which connects it to Holyhead and to Menai Bridge.
At one time it was a booming mining town that became the centre of a vast global trade in copper ore. The harbour inlet became a busy port and significant shipbuilding and ship repair centre, as well as an embarkation point with boats sailing to the Isle of Man and to Liverpool.
The name Amlwch – a reference to the site of the town's harbour, Porth Amlwch – derives from Welsh am ("about, on or around") and llwch (an old word meaning "inlet, creek" - similar to the Gaelic word "loch" for a body of water).
According to legend in the Middle Ages, the town developed on a site that had a harbour but was not visible from the sea, which helped to reduce the chance of Viking attacks.