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Navigation map of the northern South China Sea, with bathymetry (sea depth), islands, shoals and reefs. There are five maritime routes to Canton and one to Manilla marked, and inset maps of the Gulf of Tonkin and bays and islands in the Philippines.

Navigation map of the northern South China Sea, with bathymetry (sea depth), islands, shoals and reefs. There are five maritime routes to Canton and one to Manilla marked, and inset maps of the Gulf of Tonkin and bays and islands in the Philippines.

Hand-drawn portolan (nautical) chart, featuring a rhumbline network (the web of interconnected lines), bathymetry (sea depth), shoals and reefs, names of coastal settlements, and an elevation (side view) of a mountain at the north tip of Borneo.