Guy Fawkes Night is primarily observed on which island, according to Wikipedia?

According to Wikipedia, Guy Fawkes Night is primarily observed on Great Britain.

The annual event is held on 5 November and is also called Guy Fawkes Day, Bonfire Night or Firework Night. Its customs include bonfires, fireworks, processions and, traditionally, the burning of an effigy known as a “guy”. The observance is especially associated with England, Scotland and Wales, which together make up Great Britain.

The celebration commemorates the failure of the Gunpowder Plot of 1605. Guy Fawkes was arrested while guarding explosives beneath the House of Lords, where the conspirators intended to kill King James VI and I during the State Opening of Parliament.

Great Britain is not the same as the United Kingdom: Great Britain comprises England, Scotland and Wales, while the United Kingdom also includes Northern Ireland. Guy Fawkes Night has also been observed in some other places, including parts of former British territories and colonial communities, but Wikipedia identifies Great Britain as its primary setting. Northern Ireland has a more complicated and sometimes controversial relationship with the tradition.