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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 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.

Navigation chart of the Sunda Strait, focusing on bays and islands, and showing bathymetry (sea depth), anchor points, shoals and reefs. Includes an inset map of the bay of the Isle de Mew (Peucang Island). The web of lines is a rhumbline network.

Navigation chart of the Sunda Strait, focusing on bays and islands, and showing bathymetry (sea depth), anchor points, shoals and reefs. Includes an inset map of the bay of the Isle de Mew (Peucang Island). The web of lines is a rhumbline network.

The many navigation aids marked on this map, including bathymetry (sea depth), anchor points, shoals, and elevations of hills, were designed to guide ships around this part of the west coast of Timor. The Dutch fort Concordia is also marked.

A page from Abbé Prévost’s ‘Histoire Générale des Voyages’. The top map shows the Bay of Laphao on Timor, while the other drawings are side views (or ‘elevations’) of mountains on the region’s islands to use as landmarks when navigating.

Navigation map of the coast of the ancient kingdom of Pégou and near the town of Martaban (Mottama), Myanmar. Bathymetry (sea depth), anchor points, notes on currents and obstructions are marked, and there are drawings of side views of coastal hills.

Navigation map of the coast of the ancient kingdom of Pégou and near the town of Martaban (Mottama), Myanmar. Bathymetry (sea depth), anchor points, notes on currents and obstructions are marked, and there are drawings of side views of coastal hills.

Although mainly of India, this map of the Gulf of Bengal includes maritime routes near the west coast of Burma (Myanmar). The web of lines is a rhumbline network, while the numbers indicate sea depth (bathymetry), both used to aid navigation.

Although mainly of India, this map of the Gulf of Bengal includes maritime routes near the west coast of Burma (Myanmar). The web of lines is a rhumbline network, while the numbers indicate sea depth (bathymetry), both used to aid navigation.