Where Is Belfast Located in the United Kingdom?

Belfast is the capital and largest city of Northern Ireland, which is one of the four constituent countries of the United Kingdom. Geographically, it sits on the northeastern coast of the island of Ireland, at the mouth of the River Lagan where it opens into Belfast Lough, an inlet of the Irish Sea.

Northern Ireland occupies the northeastern portion of the island of Ireland, which lies off the northwestern coast of mainland Europe. Belfast's coordinates are approximately 54.6° N latitude and 5.9° W longitude.

So while Belfast is not in Great Britain (the island comprising England, Scotland, and Wales), it is unequivocally part of the United Kingdom of Great Britain and Northern Ireland.