Submarine Topography in 1963
(Source: Chart published in 1963)
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Submarine Topography in 1998
(Source: Chart revised in 1998)
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(Click the image to enlarge it.) |
(Click the image to enlarge it.) |
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from "Digital Map 200000 (Map Image) NIPPON-III" by GSI |
See "Submarine Topography around Mihara-Seto, Seto Inland Sea, Japan".