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A nautical chart of the Indian Ocean showing bathymetry (sea depth), including in great detail around the seas and straits of Southeast Asia.

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 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.

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.

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 of Asia is marked with the routes taken through Southeast Asia by the British Royal Navy captain James Cook, and the French explorer Lapérouse. The title also refers to two other explorers: Louis Antoine de Bougainville and William Dampier.

This map of Asia is marked with the routes taken through Southeast Asia by the British Royal Navy captain James Cook, and the French explorer Lapérouse. The title also refers to two other explorers: Louis Antoine de Bougainville and William Dampier.

Map of Asia spread over nine sheets, for use in schools. Place names are not printed on the map itself, but are represented by initials and numbers (presumably, there is a legend that lists the names, but it is not present).

Map of Asia spread over nine sheets, for use in schools. Place names are not printed on the map itself, but are represented by initials and numbers (presumably, there is a legend that lists the names, but it is not present).

This map of Asia features four different scales: French, Russian, Turkish and Chinese. Each country had their own measuring system, so this was not uncommon at the time.