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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 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 map of the Sunda Isles (‘Isles de la Sonde’) (with red borders) and Maluku Islands (‘Isles Moluques’) (green borders) also includes mainland Southeast Asia (blue borders), the Philippines (yellow borders) and New Guinea (green borders).

This map of Asia has coloured borders around mainland Southeast Asia, the Philippines, the Sunda Islands (‘Isles de la Sonde’) and the Maluku Islands (‘Isles Moluques’). The cartouche features a drawing of a sailing ship and boxes of goods.

The arrows on this map mark the direction of the seasonal monsoons experienced around the Sunda and Maluku Islands (mainly modern Indonesia) during the late 18th century. Each arrow has a label in French, indicating the month.

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 the Sunda Isles (‘Isles de la Sonde’) (with red borders) and Maluku Islands (‘Isles Moluques’) (blue borders) also includes mainland Southeast Asia (green borders), the Philippines (yellow borders) and New Guinea (green borders).