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A series of four maps of the Indian Ocean—one for each quarter of the calendar year—showing the direction and intensity of the winds, including around the seas of Southeast Asia. There are extensive explanatory notes.

Map of the Indian Ocean showing the currents (represented by arrows), including during the North East and North West monsoons. Numbers on the arrows indicate the current’s speed.

The arrows on this map mark the direction of the seasonal monsoons experienced around the Sunda and Maluku Islands (mainly modern Indonesia) during the late 18th century. Each arrow has a label in French, indicating the month.

The arrows on this map mark the direction of the seasonal monsoons experienced around the Sunda and Maluku Islands (mainly modern Indonesia) during the late 18th century. Each arrow has a label in French, indicating the month.

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.