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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.

This map of Asia features the ancient kingdoms of mainland Southeast Asia, such as the Birman Empire, Siam, Tonquin and Cochinchina. There are labels noting the inhabitants of some areas, such as 'Biajos' and ‘Tedongs’ in Borneo, and ‘Kemoy’ in Anam.

This map of Asia features the ancient kingdoms of mainland Southeast Asia, such as the Birman Empire, Siam, Tonquin and Cochinchina. There are labels noting the inhabitants of some areas, such as 'Biajos' and ‘Tedongs’ in Borneo, and ‘Kemoy’ in Anam.

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.

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.

A piece of paper printed with a list of the various regions of Asia, including the regions of Southeast Asia, has been adhered to the right-hand side of this late 18th century map of Asia.

This map shows the empires and kingdoms of Southeast Asia. Its decorative cartouche features drawings of plants, a camel, a vase, and the heads of children blowing to represent wind. An inset shows tall buildings, possibly Asian temples.

This map shows the empires and kingdoms of Southeast Asia. Its decorative cartouche features drawings of plants, a camel, a vase, and the heads of children blowing to represent wind. An inset shows tall buildings, possibly Asian temples.

This map of Asia is taken from Noël Antonine Pluche's ‘Concorde de la géographie des différens âges’ published in 1772.

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.