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Map of Java divided into administrative areas. Mountains are shown pictorially, major rivers are named, and the coasts have shoals. The map is orientated with south at the top, so the island looks ‘upside down’ compared to how it is usually shown.

Map of Java divided into administrative areas. Mountains are shown pictorially, major rivers are named, and the coasts have shoals. The map is orientated with south at the top, so the island looks ‘upside down’ compared to how it is usually shown.

This late 18th century map of Asia uses colour to differentiate various regions, with mainland Southeast Asia in blue, and maritime Southeast Asia in yellow, red, green and blue.

A late 18th century map of Asia with regions divided by colour-coded borders, and detailing rivers, mountains, reefs and shoals.

A late 18th century map of Asia with regions divided by colour-coded borders, and detailing rivers, mountains, reefs and shoals.

A late 18th century map of Asia featuring rivers, mountains, reefs and shoals. Regions are colour-coded, with the borders of the kingdoms of mainland Southeast Asia in green, and the islands of maritime Southeast Asia in yellow and red.

Nautical charts, like this late 18th century example of the north-west coast of Borneo, were designed to help ships navigate. The numbers marked along the coastline and sea routes indicate the depth of the sea (bathymetry).

Map of the Gaspar Strait, off the east coast of Sumatra. The web of lines is a rhumbline network, numbers indicate sea depth (bathymetry), and there are side views of islands (elevations), all to aid navigation. Five 18th century routes are marked.

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.

A map to aid navigation around the Touranne Bay (Bay of Turon, location of modern city of Da Nang, Vietnam). The web of lines is a rhumbline network, and bathymetry (sea depth), anchor points and two elevation views of the coasts are shown.

There is a port at the south of this map of the Côn Đảo archipelago (Vietnam), and notes giving details such as a suitable location to careen ships (turning a ship on its side for cleaning or repair). A ruined English fort is also marked.

Navigation chart of the Sunda Strait, showing bathymetry (sea depth), shoals and reefs, landmarks, and a rhumbline network. Notes record good anchorages, sources of water and supplies etc. Inset map of the Zutphen Islands off the coast of Sumatra.