What Separates Scotland and Belfast? The North Channel

Scotland and Belfast are not divided by a sea but by the North Channel (also called the Strait of Moyle), a narrow stretch of water between northeastern Northern Ireland and southwestern Scotland. At its narrowest, it's about 21 km (13 miles) wide.

Both Scotland and Northern Ireland are part of the United Kingdom, so there's no international border—just a maritime passage. The North Channel connects the Irish Sea to the Atlantic Ocean and is known for strong currents and scenic coastal views.