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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 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.

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.

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.

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.

Labels on this mid-18th century map of Southeast Asia describe various local peoples as ‘sauvage [savage]’, including the ‘Ke-Moy’ of the mountains along the border of Cochinchine (Vietnam) and Camboja (Cambodia), and the ‘Biayos’ of central Borneo.

Labels on this mid-18th century map of Southeast Asia describe various local peoples as ‘sauvage [savage]’, including the ‘Ke-Moy’ of the mountains along the border of Cochinchine (Vietnam) and Camboja (Cambodia), and the ‘Biayos’ of central Borneo.

Labels on this mid-18th century map of Southeast Asia describe various local peoples as ‘sauvage [savage]’, including the ‘Ke-Moy’ of the mountains along the border of Cochinchine (Vietnam) and Camboja (Cambodia), and the ‘Biayos’ of central Borneo.

Labels on this map describe various local peoples as ‘sauvage [savage]’, including the ‘Ke-Moy’ of the mountains along the border of Cochinchine (Vietnam) and Camboja (Cambodia), and the ‘Biayos’ of central Borneo. Top half of map is missing.

Labels on this mid-18th century map of Southeast Asia describe various local peoples as ‘sauvage [savage]’, including the ‘Ke-Moy’ of the mountains along the border of Cochinchine (Vietnam) and Camboja (Cambodia), and the ‘Biayos’ of central Borneo.