Ailsa Craig 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 island is located approximately 16 km (10 miles) west of Girvan. 2 miles in circumference and rising to 338 metres, the island consists entirely of a volcanic plug of an extinct volcano that might have been active