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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).

Map of the Indian Ocean dominated by a rhumbline network—a web of interconnected lines used to help plot routes—with a compass rose at the centre. At the top there are (incomplete) drawings of people with text in Dutch, French, English and Spanish.