Yu Gong
References to maritime history in the "Analects of Confucius" and the "Yu Gong" suggest their origin in a single culture while the appearance of the West River (西河) and South River (南河) in the latter indicate that the author came from the State of Wei. In the preface to his "Commentary on the Yu Gong Map" (禹贡图注), Ming Dynasty Scholar Ài Nányīng (艾南英) (1583－1646) considered the "Yu Gong " the "progenitor of all geographic texts both ancient and modern."