Anglesey Sqn Search and Rescue Helicopters, both units providing employment for about 500 civilians. RAF Valley is now the headquarters of 22 Sqn Search and Rescue. There is a wide range of smaller industries, mostly located in industrial and business parks, especially at Llangefni and Gaerwen. These include an abattoir and fine chemical manufacturing, as well as factories for timber production, aluminium smelting, fish farming and food processing. The island is also on one of the major routes from Britain to Ireland, via ferries from Holyhead, off the west of Anglesey on Holy Island, serving Dún Laoghaire and Dublin Port. Much
Salt Island, Anglesey a whole is strictly monitored and is virtually impossible for pedestrians to enter. Salt Island, Anglesey Salt Island () is joined to Holy Island, Anglesey, in North Wales. It is a natural provider of shelter for the town's Old Harbour from the Irish Sea and is part of the Port of Holyhead. The island gained its name by a factory located on it which processed sea water in order to extract sea salt. By the early 18th century, the sea salt was often mixed with rock salt (often smuggled onto the island) to increase the quality of the factory's product.