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![Francis Shepard's diagram showing worldwide distribution of known submarinecanyons map00108.jpg Francis Shepard's diagram showing worldwide distribution of known submarinecanyons](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_map00108.jpg?itok=S8vLL3Dw)
Description
Francis Shepard's diagram showing worldwide distribution of known submarinecanyons. The predominance of known canyons off the United States and thePhilippines is the result of work of the United States Coast and Geodetic Survey and its development of the radio-acoustic ranging navigation system prior to WW II. Published in Geographical Review, July, 1938. (Image credit: NOAA Central Library Historical Collection)