In which country of the UK is The Giant's Causeway located?

The Giant's Causeway is an iconic natural wonder located in Northern Ireland, known for its unique hexagonal basalt columns formed by volcanic activity around 60 million years ago. This site is not only a geological curiosity but also a UNESCO World Heritage Site, attracting numerous visitors each year for its stunning landscapes and rich mythology, including tales involving giants.

The other options, while comprised of regions within the UK, do not house the Giant's Causeway. England, Scotland, and Wales each have their own distinct natural and cultural landmarks, but the specific geological formation and historical significance of the Giant's Causeway are tied uniquely to Northern Ireland.