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Maritime routes had to be adjusted in response to the changing monsoon seasons, as is seen on this late 18th century map of the Indian Ocean. Drawings of the heads of children blowing—called ‘wind-heads’—are used to indicate wind direction.

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.

On the right of this map, Latin text held within an elaborate border notes that five of the Maluku Islands are located nearby—Ternate, Tidore, Moti, Makian and Bacan—which trade spices including clove, cinnamon, nutmeg and ginger to the world.

On the right of this map, Latin text held within an elaborate border notes that five of the Maluku Islands are located nearby—Ternate, Tidore, Moti, Makian and Bacan—which trade spices including clove, cinnamon, nutmeg and ginger to the world.