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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 mouth of the Padang Tikar River, on the west coast of Borneo, featuring bathymetric (water depth) routes. Obstructions are marked with letters: ‘m’ (mud), ‘z’ (sand). Trees, hills and fishermen’s houses are shown as landmarks.

Navigation map of the mouth of the Padang Tikar River, on the west coast of Borneo, featuring bathymetric (water depth) routes. Obstructions are marked with letters: ‘m’ (mud), ‘z’ (sand). Trees, hills and fishermen’s houses are shown as landmarks.