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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.

Map of the Dutch East Indies featuring maritime routes from the Sunda Strait and Batavia (Jakarta) to the Maluku or Spice Islands (Ambon, Ternate etc.). There is an eastern route (taken from October to March) and a return route (December to March).

Map of the Dutch East Indies featuring maritime routes from the Sunda Strait and Batavia (Jakarta) to the Maluku or Spice Islands (Ambon, Ternate etc.). There is an eastern route (taken from October to March) and a return route (December to March).

This map of Asia is marked with the routes taken through Southeast Asia by the British Royal Navy captain James Cook, and the French explorer Lapérouse. The title also refers to two other explorers: Louis Antoine de Bougainville and William Dampier.

This map of Asia is marked with the routes taken through Southeast Asia by the British Royal Navy captain James Cook, and the French explorer Lapérouse. The title also refers to two other explorers: Louis Antoine de Bougainville and William Dampier.

The ancient kingdoms of mainland Southeast Asia are shown on this map of Asia, including the Birman Empire (Myanmar), the Kingdom of Siam (Thailand), and the Empire of Annam (Vietnam).

The ancient kingdoms of mainland Southeast Asia are shown on this map of Asia, including the Birman Empire (Myanmar), the Kingdom of Siam (Thailand), and the Empire of Annam (Vietnam).

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.