Thousands of people are taking part in the annual 12th of July festivities across Northern Ireland.
Nineteen parades are taking place to mark the 326th anniversary of the Battle of the Boyne.
The flagship demonstrations are happening this year in Portadown in Co Armagh and Kilkeel in Co Down.
The largest demonstration will take place in Portadown.
Regarded as the biggest gathering of Orangemen on the day, a total of 11 District lodges will be on parade for this year’s event, with a total of 154 private lodges and almost 5,000 brethren stepping out.
DUP leader and First Minister Arlene Foster is attending the Orange Institution demonstration in Maguiresbridge in her home county of Fermanagh.
The longest route is in Belfast, with a parade leaving Belfast Orange Hall at Carlisle Circus, making its way to City Hall where a wreath-laying ceremony will take place at the Cenotaph.
The memorial service marked the 100th anniversary of the Battle of the Somme.
The parade then proceeds via Donegal Square West, Bedford Street, Dublin Road, Shaftesbury Square, Bradbury Place, Lisburn Road, Balmoral Avenue and Malone Road to Barnetts Demesne.
The parades will inevitably mean some road closures and traffic disruption and a major police operation has been planned.