Rosia Water Tanks, Gibraltar

"Gibraltar Rosia Tanks were probably the first water tanks or cisterns built to store and supply water to the Royal Naval fleet on this scale. The Rosia Tanks were built 1799-1804 because Admiral St Vincent was staying ashore in Gibraltar in 1799 and realised that a reliable water supply and victualling store were needed there. There were no other British or allied naval bases in the Mediterranean and Tetuan and Ceuta could not be relied upon consistently for supplies...."