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To aid navigation, this map shows small islands, shoals and reefs, maritime routes for use during monsoons or at particular times of the year, bathymetry (sea depth), tide information, shipwrecks, compass roses and landmark mountains at the coasts.

Navigation map of the southern South China Sea, with bathymetry (sea depth), islands, shoals and reefs marked. There are four maritime routes to China marked, with notes on what months or monsoon season to use them. Inset map of Gulf of Thailand.

Navigation map of the southern South China Sea, with bathymetry (sea depth), islands, shoals and reefs marked. There are four maritime routes to China marked, with notes on what months or monsoon season to use them. Inset map of Gulf of Thailand.

To aid navigation, this map shows small islands, shoals and reefs, maritime routes for use during monsoons or at particular times of the year, bathymetry (sea depth), past explorers’ routes, shipwrecks and text about monsoons, typhoons and currents.

The arrows on this map show the direction of the seasonal monsoons of Southeast Asia during the late 18th century. Each arrow has a label in French, indicating the month. The hatched sea areas are where the winds always blow in the same direction.