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Caolas is a small settlement on the island of Vatersay, in the Outer Hebrides, Scotland. Caolas is within the parish of Barra. It is the westernmost settlement in Scotland. Previously, the village on Hirta claimed this title; Hirta was also the most western settlement in the United Kingdom, which is now Belleek, County Fermanagh, Northern Ireland.

Caolas is a word (in both Scottish Gaelic and Irish) meaning "straits" and frequently rendered as "kyles" in English.