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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.

Marine chart of the Pacific Ocean, including Southeast Asia. Small islands, shoals and reefs are marked, and often named, around the seas and straits of the region.

In the 18th century, European maps tended to use their own country’s meridian, so on this French map of Asia longitude is measured from the Paris Meridian. Southeast Asia is divided into regions such as the Birman Empire, Yunshan and Tonquin.

In the 18th century, European maps tended to use their own country’s meridian, so on this French map of Asia longitude is measured from the Paris Meridian. Southeast Asia is divided into regions such as the Birman Empire, Yunshan and Tonquin.