Charts. Serpents Mouth (Boca de la Sierpe), south entrance to Gulf of Paria, South America, northeast coast, from survey by U.S.S. Hannibal in 1931 and British surveys in 1866 and 1898, Trinidad I. from British colonial survey in 1920-25; with inset, Serpents Mouth, eastern and second channels, from British survey in 1898; chart 1963. Scale naut. m.=1.5 in., natural scale 1:50,000.

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