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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.

Map of the Indian Ocean showing the currents (represented by arrows) and winds (represented with letters A to F) during the monsoon seasons. Three routes—one old and two new—from the Isle de France (Mauritius) east to the Strait of Malacca are shown.

Map of the Indian Ocean showing the currents (represented by arrows) and winds (represented with letters A to F) during the monsoon seasons. Three routes—one old and two new—from the Isle de France (Mauritius) east to the Strait of Malacca are shown.

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.

Map of the Indian Ocean showing the currents (represented by arrows) and winds (represented with letters A to G) during the monsoon seasons. Three routes from the Isle de France (Mauritius) around the Indian Ocean are shown.

Map of the Indian Ocean showing the currents (represented by arrows) and winds (represented with letters A to G) during the monsoon seasons. Three routes from the Isle de France (Mauritius) around the Indian Ocean are shown.

Map of the Indian Ocean showing the currents (represented by arrows) and winds (represented with letters A to G) during the monsoon seasons. Three routes from the Isle de France (Mauritius) around the Indian Ocean are shown.

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.