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Mid-section of Bathymetrical Chart of the Oceans showing the "Deeps" according to Sir John Murray. This section of the map shows the Mid-Atlantic Ridge as well as all areas of the Atlantic Ocean and eastern Pacific Ocean where depths greater than 3,000 fathoms (deeps) had been discovered. Scottish Geographical Magazine, Volume XV, 1899. P. 560. Image courtesy of NOAA Photo Library.