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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.

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.

A late 18th century map of Asia, with notes on the principal states, empires and kingdoms of Asia written in French on the right-hand side.

The arrows on this map show the direction of the seasonal monsoons of Southeast Asia during the late 18th century. Each arrow has a label in French, indicating the month. The hatched sea areas are where the winds always blow in the same direction.

Map of the regions, empires and states of Asia. Extensive notes cover religion (people of mainland Southeast Asia are idolaters), colonialism (Dutch and Portuguese rule in Malacca and the Sunda Islands) and the spice trade of the Maluku Islands.

Map of the regions, empires and states of Asia. Extensive notes cover religion (people of mainland Southeast Asia are idolaters), colonialism (Dutch and Portuguese rule in Malacca and the Sunda Islands) and the spice trade of the Maluku Islands.

The title of this mid-18th century map translates as ‘Asia following the latest observations of the Muscovites/Russians’. Written notes in French list the regions, islands, empires, kingdoms, colonial possessions, religions and languages of Asia.

The note in French at the top left of this map states that although the map is accurate, the names of many small islands have been omitted to avoid confusion, and that more details will come later.