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Southeast Asia is on the last sheet of this map of Asia. The South China Sea is labelled ‘Malayan Sea’. Small islands, shoals and reefs are shown. A label in Cochin China (Vietnam) reads ‘mountains inhabited by the uncivilized people called Kemoys’.

Nautical charts, like this late 18th century example of the north-west coast of Borneo, were designed to help ships navigate. The numbers marked along the coastline and sea routes indicate the depth of the sea (bathymetry).

A map of the China Sea between Malaya, Sumatra and Borneo. The numbers indicate sea depth (bathymetry), and there are drawings of the side views of some of the islands (elevations), both used to aid navigation. Some maritime routes are also marked.