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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.

Map focusing on the passages between the islands of maritime Southeast Asia used to travel between the Indian and Pacific oceans. Includes the Strait of Malacca, many straits between the Sunda Islands, and a route through the Maluku Islands.

Map focusing on the passages between the islands of maritime Southeast Asia used to travel between the Indian and Pacific oceans. Includes the Strait of Malacca, many straits between the Sunda Islands, and a route through the Maluku Islands.

This 18th century map of Southeast Asia by the French cartographer Gilles Robert de Vaugondy features the national borders of the Philippines in green, and of modern Indonesia in yellow. The Malay Peninsula and modern Cambodia and Vietnam are in red.

The coast of New Guinea (‘Nouvelle Guinée’) is represented in part by a dotted line on this mid-18th century map, indicating that the exact coastlines were unknown at this time. The western tip is labelled ‘C. de Bonne Esperance [Cape of Good Hope]’.