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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 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 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.

On this map of Asia, New Guinea is shown as two separate islands—the western part as ‘Isle de Papous’ and the eastern part as ‘Nouvelle Guinée’—showing that in the 1770s the details of the region were uncertain.

On this map of Asia, New Guinea is shown as two separate islands—the western part as ‘Isle de Papous’ and the eastern part as ‘Nouvelle Guinée’—showing that in the 1770s the details of the region were uncertain.

A hand-written note on the bottom margin of this map reads ‘Dressé par Rizzi Zannoni, gravé par Lattré, 1762’, indicating that it was drawn by the Italian cartographer Giovanni Antonio Rizzi Zannoni, and engraved by the French engraver Jean Lattré.

A hand-written note on the bottom margin of this map reads ‘Dressé par Rizzi Zannoni, gravé par Lattré, 1762’, indicating that it was drawn by the Italian cartographer Giovanni Antonio Rizzi Zannoni, and engraved by the French engraver Jean Lattré.

Map of Asia based on observations of members of the French Academy of Sciences. Its decorative cartouche features a drawing of a censer (incense burner).

Map of Asia based on observations of members of the French Academy of Sciences. Its decorative cartouche features a drawing of a censer (incense burner).

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.