|Ailsa Craig (Scottish Gaelic: Creag Ealasaid) is an island in the outer Firth of Clyde, Scotland where granite was quarried to make curling stones. "Ailsa" is pronounced "ale-sa", with the first syllable stressed. The now uninhabited island is formed from the volcanic plug of an extinct volcano.|
The island was a haven for Catholics during the Scottish Reformation in the 16th century, but is today a bird sanctuary, providing a home for huge numbers of gannets and an increasing number of puffins.
Ailsa Craig is uninhabited, the lighthouse having been automated in 1990. Though quarry blasting is no longer allowed, loose granite rock from the island has been recently used for manufacture into curling stones by the Kays of Scotland company.