ROCKY-ISLAND, an island, in the parish of TEMPLEROBIN, barony of BARRYMORE, county of CORK, and province of MUNSTER, 1 mile (S.) from Cove, in the harbour of Cork; the population is returned with Hawlbowling island. This island, an immense mass of limestone rising abruptly from the bay to the height of 42 feet above high water mark, and terminating in a conical point, was selected by the Board of Ordnance as a magazine for the military depôt of the south of Ireland. In 1815, the surface of the rock, with the exception of its summit, on which a watch-tower has been formed, approached by a winding stair-case cut in the solid rock, was levelled; and beneath it large vaults have been excavated, to each of which is a separate entrance from a deep road-way sunk in the rock, and continued round its entire circumference. The magazine contains 25,000 barrels of gunpowder, and is under the care of a detachment of the artillery from the establishment at Spike island, who are the only inhabitants of the place. The approach from the bay to the road surrounding the magazine is through a lofty archway hewn out of the rock. In the R. C. divisions it forms part of the union or district of Passage.