Is Ireland in the UK?
The country of Ireland, sometimes referred to as the Republic of
Ireland, and often incorrectly referred to as Southern Ireland, is
not in the UK. Northern Ireland (which contains the majority of the
province of Ulster) is in the UK. The Republic of Ireland and
Northern Ireland are both on the island of Ireland. As a result,
Northern Ireland is the only part of the UK with a land border,
sharing it with the Republic of Ireland.