Pladda, an island of Kilmorie parish, Buteshire, in the Firth of Clyde, 5¾ furlongs S of the south-eastern extremity of Arran. Measuring 3½ by 1½ furlongs, it is low and green; and has a lighthouse, erected partly in 1790, partly in 1826, and showing two fixed lights, the one above the other, at elevations of 77 and 130 feet above high-water level, and visible at the distance of 14 and 17 nautical miles. The Sound of Pladda, between the island and Arran, has a chain of rock nearly right across, with depths of from only 2 to 4 feet of water, so that it is unnavigable by any sea-borne vessels.Ord. Sur., sh. 13, 1870.
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