Parades are taking place across Northern Ireland to mark the Twelfth of July.
A total of 18 Orange demonstrations will be held as part of commemorations for the 328th anniversary of the Battle of the Boyne, with every county represented.
The march in Belfast covers a six-mile route, from the city centre to Barnett’s Park.
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Some of the other larger events are taking place in Londonderry, Loughgall, Ballyclare, Newcastle, Brookeborough and Stewartstown.
Tens of thousands of Orangemen and women, as well as band members, are joined by large numbers of spectators along the routes.
Police are advising motorists to expect delays throughout the day in towns where demonstrations are taking place.