Caol Ila is the largest distillery on the island of Islay, producing over 2 million liters every year. The vast majority of that goes into Diageo-owned blends like Johnnie Walker Black Label, but there still remains some for eventual release as single malts. While the 12 Year is their single malt cornerstone, the distillery has been releasing a yearly series of unpeated whiskies over the past several years, including the 17 Year. The Caol Ila 15 Year is the first of a reported thirteen releases in the series.