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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.

Southeast Asia is shown on sheets two and three of this 12-sheet map of the Indian and Pacific oceans, including detailed inset maps of the straits of Singapore, Bangka, Gaspar and Sunda, with bathymetry (sea depth), shoals, reefs, anchorages etc.

Map of the Asian colonial possessions of the Netherlands (Dutch East Indies), with an inset of the heights of some of the region’s mountains. A note describes the average temperature, barometer reading and magnetic declination in Batavia at the time.

Map of Southeast Asia highlighting the colonial possessions of the Netherlands (Dutch East Indies), Spain (Philippines), Britain (Straits Settlements, Burma, part of Borneo) and Portugal (East Timor). From the German atlas ‘Stielers Handatlas’.

Map of the Asian colonial possessions of the Netherlands (Dutch East Indies), with an inset of the heights of some of the region’s mountains. A note describes the average temperature, barometer reading and magnetic declination in Batavia at the time.

On this map of Southeast Asia, British colonial territory is highlighted within red borders: the Straits Settlements (Singapore, Malacca and Penang) on the west coast of the Malay Peninsula; and British Burma (Chittagong and Aracan, and Tenasserim).

Map of the Asian colonial possessions of the Netherlands (Dutch East Indies), with an inset of the heights of some of the region’s mountains. A note describes the average temperature, barometer reading and magnetic declination in Batavia at the time.

Map of Southeast Asia highlighting the colonial possessions of the Netherlands (Dutch East Indies), Spain (Philippines), Britain (Straits Settlements, Burma, part of Borneo) and Portugal (East Timor). From the German atlas ‘Stielers Handatlas’.

Map of the Asian colonial possessions of the Netherlands (Dutch East Indies), with an inset of the heights of some of the region’s mountains. A note describes the average temperature, barometer reading and magnetic declination in Batavia at the time.

Map of the Asian colonial possessions of the Netherlands (Dutch East Indies), with an inset of the heights of some of the region’s mountains. A note describes the average temperature, barometer reading and magnetic declination in Batavia at the time.

This map focuses on maritime Southeast Asia, with coastal settlements, rivers, bays, islands, straits and seas named. Shoals and reefs are marked. The only land feature is the mountains of Borneo, represented by short lines/dashes (called hachures).