Leinster

Leinster runs the eastern Irish coast from the Carlingford Lough at the Northern Ireland border south through Dundalk Bay, the long ribbon of the Cooley and Boyne mouths, around Dublin Bay and on to Wexford and the south-east corner at Carnsore Point. The tide here runs the Irish Sea signature: cleanly semidiurnal in pattern, with the height of the swing varying notably along the coast because of the basin's amphidromic system. Mean range at Dublin's North Wall on the Liffey mouth is about 3.4 metres, climbing past 4.3 on spring tides and dropping near 1.7 on neaps. The pattern is two highs and two lows about twelve and a half hours apart. Further south at Wexford and Rosslare the range compresses, and at the south-east corner near Carnsore the swing drops to under 2 metres because the Irish Sea amphidrome sits roughly between Ireland and Wales. The Liffey at the Custom House quays, the long sand at Dollymount and Sandymount, and the rocky shore at Howth Head and Dalkey all swing through the full range. Walkers reading South Bull beach at low water, kayakers in Dublin Bay, and angler clubs working Wexford Harbour all read the table for different windows. The UK Hydrographic Office Admiralty TotalTide and the Marine Institute of Ireland publish authoritative predictions for the east coast.