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Map of Asia featuring steamship routes—including around Southeast Asia—connecting ports such as Penang, Singapore, Batavia (Jakarta), Saigon, Bangkok, Rangun (Yangon), Manila, Macassar (Makassar) etc. There is also an inset map of Singapore.

Navigation map of the northern South China Sea, with bathymetry (sea depth), islands, shoals and reefs. There are five maritime routes to Canton and one to Manilla marked, and inset maps of the Gulf of Tonkin and bays and islands in the Philippines.

Navigation map of the southern South China Sea, with bathymetry (sea depth), islands, shoals and reefs marked. There are four maritime routes to China marked, with notes on what months or monsoon season to use them. Inset map of Gulf of Thailand.

Navigation map of the northern South China Sea, with bathymetry (sea depth), islands, shoals and reefs. There are five maritime routes to Canton and one to Manilla marked, and inset maps of the Gulf of Tonkin and bays and islands in the Philippines.

Navigation map of the southern South China Sea, with bathymetry (sea depth), islands, shoals and reefs marked. There are four maritime routes to China marked, with notes on what months or monsoon season to use them. Inset map of Gulf of Thailand.

Chart of maritime Southeast Asia, showing bathymetry (sea depth), islands, shoals, reefs, landmarks, and notes (‘Rock seen at Low Water’), all to aid navigation. A rhumbline network has been drawn on the map in pencil. Only one sheet is present.

Chart of maritime Southeast Asia, showing bathymetry (sea depth), islands, shoals, reefs, landmarks, and notes (‘Rock seen at Low Water’), all to aid navigation. A rhumbline network has been drawn on the map in pencil. Only one sheet is present.

Navigation chart of the east coast of mainland Southeast Asia, from Cambodia to China. Islands, shoals and reefs are marked, along with bathymetry (sea depth). There are seven side views of islands (elevations) to use as landmarks.

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.

Hand-drawn portolan (nautical) chart, featuring a rhumbline network (the web of interconnected lines), bathymetry (sea depth), shoals and reefs, names of coastal settlements, and an elevation (side view) of a mountain at the north tip of Borneo.