Belfast

Belfast is the capital of Northern Ireland and the centre of its largest urban area. The city lies at the head of Belfast Lough, in the lower Lagan Valley. Black Mountain rises to the west and the Castlereagh Hills to the east, framing the city’s position between hills, river and coast. [Belfast City Council](https://minutes.belfastcity.GOV.UK/%28S%28xhe05jzjdwiv1tvargp0uh45%29%29/documents/s122515/Appendix%20A%20-%20Belfast%20City%20Council%202025%20Air%20Quality%20Progress%20Report.pdf)

The city council area forms the core of a wider metropolitan area that extends into neighbouring districts. That distinction matters when describing Belfast: the built-up area and its surrounding communities reach beyond one local authority boundary. The city’s regional role therefore includes both its own neighbourhoods and connections with settlements towards Lisburn, Newtownabbey and North Down. [Geographical profile](https://minutes.belfastcity.GOV.UK/%28S%28xhe05jzjdwiv1tvargp0uh45%29%29/documents/s122515/Appendix%20A%20-%20Belfast%20City%20Council%202025%20Air%20Quality%20Progress%20Report.pdf)