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A nautical chart of the Indian Ocean showing bathymetry (sea depth), including in great detail around the seas and straits of Southeast Asia.

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 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.

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.

Map based on the expeditions of Jean-François de Surville, a merchant captain with the French East India Company. Some details are from the diary of the French Navy officer Théobald René, Comte de Kergariou-Locmaria, who explored the region in 1785.

Map based on the expeditions of Jean-François de Surville, a merchant captain with the French East India Company. Some details are from the diary of the French Navy officer Théobald René, Comte de Kergariou-Locmaria, who explored the region in 1785.

Map based on the expeditions of Jean-François de Surville, a merchant captain with the French East India Company. Some details are from the diary of the French Navy officer Théobald René, Comte de Kergariou-Locmaria, who explored the region in 1785.

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.