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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.

Chart of the Indian Ocean, showing climate and weather-related data, including around the seas and straits of Southeast Asia where trade routes are marked, along with monsoon and typhoon regions, and currents during the different monsoon seasons.

Chart of the Pacific Ocean, showing climate and weather-related data, including around the seas and straits of eastern Southeast Asia where maritime trade routes are marked, along with monsoon regions, ocean temperatures and currents.

The colonial possessions of Britain, the Netherlands, Spain, Portugal and Denmark are shown on this mid-19th century map of Southeast Asia. There are inset maps of Penang Island and Singapore, and text describing the region’s colonial history.