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Navigation map of the southern part of the South China Sea, including the straits of Malacca and Singapore, and the Riau Archipelago. Bathymetry (sea depth), lighthouses, shoals and other obstructions are marked, with hills to use as landmarks.

Navigation map of the southern part of the South China Sea, including the straits of Malacca and Singapore, and the Riau Archipelago. Bathymetry (sea depth), lighthouses, shoals and other obstructions are marked, with hills to use as landmarks.

Map of part of Southeast Asia, featuring a maritime route from the Sunda Strait to the ports of Bantam (Banten) and Batavia (Jakarta) on Java, and then up through the Gulf of Thailand to the Kingdom of Siam. The return route is also marked.

Map of part of Southeast Asia, featuring a maritime route from the Sunda Strait to the ports of Bantam (Banten) and Batavia (Jakarta) on Java, and then up through the Gulf of Thailand to the Kingdom of Siam. The return route is also marked.

Hand-drawn map of the Singapore Strait, with Singapore above (green coastline) and the Riau Archipelago below. Bathymetry (sea depth), shoals and reefs are marked. Two mountains at the eastern end of the strait are shown in profile as landmarks.