Anglesey who could speak Welsh are as follows: Today, Welsh is less widely used on the island, but it is still the dominant language in certain areas, particularly in the centre, including the town of Llangefni, and some areas of the south coast. A notable example is the village of Llanfairpwll. The island's five secondary schools vary widely in the percentage of their pupils who come from predominantly Welsh-speaking homes, as do the percentages who can speak Welsh: The geology of Anglesey is notably complex and is frequently used for geology field trips by schools and colleges. Younger strata in Anglesey
Port of Holyhead trade war with the newly established Republic of Ireland had an adverse effect on the level of use of the port, which caused widespread unemployment in the town of Holyhead. During the Second World War, however, the Royal Dutch Navy began using the port as a base. In June 1939, the Royal Navy submarine "HMS Thetis" sank during sea trials in Liverpool Bay and it was subsequently brought to the harbour at Holyhead after being beached at Traeth Bychan. It remained at Holyhead in dry dock while the contents were removed; fourteen of the 99 victims were buried locally. A