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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.

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.

French text on the reverse of this map of the eastern Sunda Islands describes the city of Macassar (modern Makassar) on Celebes (Sulawesi, Indonesia). Details include the city’s port, trade and crops, as well as its people and religion.