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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 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 of Asia spread over nine sheets, for use in schools. Place names are not printed on the map itself, but are represented by initials and numbers (presumably, there is a legend that lists the names, but it is not present).

Map of Asia spread over nine sheets, for use in schools. Place names are not printed on the map itself, but are represented by initials and numbers (presumably, there is a legend that lists the names, but it is not present).

This map of Asia features the ancient kingdoms of mainland Southeast Asia, such as the Birman Empire, Siam, Tonquin and Cochinchina. There are labels noting the inhabitants of some areas, such as 'Biajos' and ‘Tedongs’ in Borneo, and ‘Kemoy’ in Anam.

This map of Asia features the ancient kingdoms of mainland Southeast Asia, such as the Birman Empire, Siam, Tonquin and Cochinchina. There are labels noting the inhabitants of some areas, such as 'Biajos' and ‘Tedongs’ in Borneo, and ‘Kemoy’ in Anam.

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 Asia features four different scales: French, Russian, Turkish and Chinese. Each country had their own measuring system, so this was not uncommon at the time.

This map of Asia features four different scales: French, Russian, Turkish and Chinese. Each country had their own measuring system, so this was not uncommon at the time.

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.