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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.

This late 19th century map of Southeast Asia shows the best maritime routes around the region, according to the time of year. There are also inset maps highlighting the rivers and southern islands of Singapore, and the sea depth around Labuan Island.

This detailed map of the Dutch East Indies in the mid-19th century contains a great deal of information: topographical details, settlements and administrative areas, roads, railways and maritime routes, telegraph lines, inset maps etc.

This late 19th century map of Southeast Asia shows the best maritime routes around the region, according to the time of year. There are also inset maps highlighting the rivers and southern islands of Singapore, and the sea depth around Labuan Island.

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.

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.

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 late 19th century map of Southeast Asia shows the best maritime routes around the region, according to the time of year. There is also an inset map highlighting the rivers and southern islands of Singapore.