Six Counties

Từ điển Oxford Advanced Learner 8th

the ˌSix ˈCounties 7 [Six Counties] BrE NAmE noun plural
a way of referring to Northern Ireland, used especially by people who want the whole of Ireland to be one country

Culture:
The six counties are Antrim, ↑Armagh, Down, ↑Fermanagh, ↑Londonderry and Tyrone. Historically, the ancient Irish kingdom of ↑Ulster was divided into nine counties. Six of these counties remained part of the ↑United Kingdom in 1921. Because of this, some people, mostly Nationalists (= people who want the whole of Ireland to be one country) refer to Northern Ireland as ‘the Six Counties’. In 1973, the six counties were replaced by 26 local-government areas known as ‘districts’, each with its own ‘district council’.