Inishtrahull Lighthouse is the northerly most lighthouse in Ireland located on the Inishtrahull Island off the coast of County Donegal. Coupled with the lighthouse on Tory Island they form the two main landfall lights for shipping from the Atlantic rounding the north coast of Ireland, and navigation to local shipping. Work on the first lighthouse, situated at the east end of the island began in 1812, primarily due to Royal Navy ships using Lough Foyle. The station became unmanned at 1200 hours on 30 April 1987.The fog signal was discontinued the following day.