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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 maritime routes, including some to and around Southeast Asia, where they pass through the Strait of Malacca, the Sunda Strait, and the straits between the Lesser Sunda Islands.

Map focusing on the passages between the islands of maritime Southeast Asia used to travel between the Indian and Pacific oceans. Includes the Strait of Malacca, many straits between the Sunda Islands, and a route through the Maluku Islands.

Map focusing on the passages between the islands of maritime Southeast Asia used to travel between the Indian and Pacific oceans. Includes the Strait of Malacca, many straits between the Sunda Islands, and a route through the Maluku Islands.

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.