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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 Dutch colonial territory in Southeast Asia, including the administrative areas of Java and Madura. Two maritime routes are marked from Batavia to the Maluku Islands: of the brig ‘Douga’ in 1825, and by Baron Godert van der Capellen in 1824.

Map of Dutch colonial territory in Southeast Asia, including the administrative areas of Java and Madura. Two maritime routes are marked from Batavia to the Maluku Islands: of the brig ‘Douga’ in 1825, and by Baron Godert van der Capellen in 1824.

A French map of the Asian colonial possessions of the Netherlands (Dutch East Indies), with an inset map of the island of Java. Colonies of Britain (Malay Peninsula), Spain (the Philippines) and Portugal (parts of Floris and Timor) are also marked.

A French map of the Asian colonial possessions of the Netherlands (Dutch East Indies), with an inset map of the island of Java. Colonies of Britain (Malay Peninsula), Spain (the Philippines) and Portugal (parts of Floris and Timor) are also marked.

Colonial possessions of the Dutch, Spanish and Portuguese, as well as lands of ‘indigenous princes’ are marked with coloured borders on this map of maritime Southeast Asia. Hot springs and mineral water springs in Java are also listed.

Map of the Indian Ocean showing the currents (represented by arrows) and winds (represented with letters A to F) during the monsoon seasons. Three routes—one old and two new—from the Isle de France (Mauritius) east to the Strait of Malacca are shown.

Map of the Indian Ocean showing the currents (represented by arrows) and winds (represented with letters A to F) during the monsoon seasons. Three routes—one old and two new—from the Isle de France (Mauritius) east to the Strait of Malacca are shown.

Map of the Indian Ocean showing the currents (represented by arrows) and winds (represented with letters A to G) during the monsoon seasons. Three routes from the Isle de France (Mauritius) around the Indian Ocean are shown.

Map of the Indian Ocean showing the currents (represented by arrows) and winds (represented with letters A to G) during the monsoon seasons. Three routes from the Isle de France (Mauritius) around the Indian Ocean are shown.

Map of the Indian Ocean showing the currents (represented by arrows) and winds (represented with letters A to G) during the monsoon seasons. Three routes from the Isle de France (Mauritius) around the Indian Ocean are shown.