Ailsa Craig

Ailsa Craig, sometimes referred to as the Granite Jewel of the Firth of Clyde, is an island that sits in the outer Firth of Clyde. Around 99 hectares in size, Ailsa Craig is comprised from a volcanic plug from an extinct volcano. The island, colloquially known as "Paddy's Milestone" because it is halfway between Belfast and Glasgow

It is currently owned by a nature conservation trust as it contains some of Europe's most important bird colonies. This includes the continent’s biggest gannet colony and a significant number of puffins. It's blue hone granite is also good for the manufacture of curling stones, two-thirds of stones in use today are made from it.