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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.

A series of four maps of the Indian Ocean—one for each quarter of the calendar year—showing the direction and intensity of the winds, including around the seas of Southeast Asia. There are extensive explanatory notes.

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 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.

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.

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).