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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.

French text on the reverse of this map describes the religion, languages, crops, trade etc. of Aracam and Pegu (Myanmar), Siam (Thailand), Cambaja (Cambodia). The map is dedicated to the Dutch merchant Christophoro Thisio.

As was common in this era, this map mistakenly shows the bottom of Peninsula Malaya as a separate island. The map also features illustrations of ships and a sea monster. Text on the reverse describes the people, crops, geography of the region.

As was common in this era, this map mistakenly shows the bottom of Peninsula Malaya as a separate island. The map also features illustrations of ships and a sea monster. Latin text on the reverse describes the people, crops, geography of the region.