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Map of the South China Sea between mainland Southeast Asia and the Philippines. Shoals and reefs, especially the Paracel Islands (‘Poulo Parcellas’), are shown. Bathymetry (sea depth) is indicated by the numbers marked along coastal routes.

Map of the coast of Tsiompa and Couchinchina (Vietnam) designed for navigation, with a rhumbline network and bathymetry (sea depth). The large area marked with crosses represents the Paracel Islands. The modern city of Da Nang is at the far right.