Cuan Sound is a narrow channel, 200 metres (660 ft) wide, located in Argyll, western Scotland. It separates Seil Island and Luing and later becomes the Firth of Lorn. It has a very strong current. In Cuan Sound, the north-going stream begins 4.5 hours after high water Oban and sets westward; the south-going stream begins 1.5 hours before high water Oban and sets eastward; the streams attain a rate of 7 knots at springs. This coast from Cuan Sound to Easdale Bay is in many places foul and rocky for 1.5 cables of it. Sgeir na Faoileann, a rock above water, one cable from the shore, and 3.5 cables northward of the entrance to Cuan Sound, is surrounded by foul ground, which extends 1.5 cables south-westward from it. Coirebhreacain and Cuan Sound are seldom attempted except near slack water.
- Bartholomew, John George (1904). The survey gazetteer of the British Isles, topographical, statistical, and commercial: compiled from the 1901 census and the latest official returns (Public domain ed.). G. Newnes, limited. pp. 209–. Retrieved 29 October 2011.
- Great Britain. Hydrographic Dept (1911). West Coast of Scotland Pilot (Public domain ed.). Printed for the Hydrographic Department, Admiralty by Taylor, Garnett, Evans, & Co. pp. 157–. Retrieved 29 October 2011.
- U.S. Coast and Geodetic Survey (1907). Report of the Superintendent ... showing the progress of the work (Public domain ed.). Govt. print. off. pp. 350–. Retrieved 29 October 2011.
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