Kilbrannan Sound is the western arm of the Firth of Clyde, reaching down the whole west side of Arran and the greater part of Kintyre's eastern shore. It is joined to the main body of the Firth of Clyde in the north by the Sound of Bute, and at its southern end the Firth opens into the North Channel.
- Location map: 55°36’34"N, 5°25’60"W
- Francis Hindes Groome. 1882. Ordnance gazetteer of Scotland: a survey of Scottish topography. Page 70