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Unusually, north is located to the left of this map of East Asia, rather than the top. The text notes that shallows and reefs are marked, and that the map is based on the explorations of Portuguese ships. Illustrations include sea monsters and ships.

Colourful hand-drawn portolan (nautical) navigation chart, featuring a rhumbline network (the web of interconnected lines), islands, shoals and reefs. With elaborately decorated scales and compass roses. Mounted on folding wood boards.

Colourful hand-drawn portolan (nautical) navigation chart, featuring a rhumbline network (the web of interconnected lines), islands, shoals and reefs. With an elaborately decorated cartouche, scale and compass roses. Vellum on folding wood boards.

Hand-drawn portolan (nautical) chart, featuring a rhumbline network (the web of interconnected lines), bathymetry (sea depth), shoals and reefs, and names of coastal settlements, all to aid navigation. With a colourful compass rose.

An early 18th century navigation map, with a rhumbline network and a scale in English, French, Spanish and Dutch measurements. The cartouche includes a drawing of Asian people as primitive natives, as they were often seen in the West at the time.

This early 18th century maritime map charts the waters of the Straits of Sunda, between the islands of Java and Sumatra. The web of lines is a rhumbline network, while the numbers indicate sea depth (bathymetry), both used to aid navigation.

A map by the influential London cartographer, Herman Moll (1654?—1732), showing Southeast Asia in the context of the wider Asian region. Interestingly, the Strait of Malacca is labelled as the ‘Str. of Sincapora’ (Straits of Singapore).

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.

A late 18th century maritime map of Southeast Asia, marked with expedition routes including the return of Captain Cook’s HMS Endeavour from Australia in 1770, and Captain Philip Carteret’s circumnavigation expedition in 1768.

A map of the China Sea between Malaya, Sumatra and Borneo. The numbers indicate sea depth (bathymetry), and there are drawings of the side views of some of the islands (elevations), both used to aid navigation. Some maritime routes are 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.

Nautical charts like this are detailed around the coasts and on the seas (e.g. river mouths, islands, shoals and reefs) while the interiors are blank. The web of lines is a rhumbline network, while the numbers indicate sea depth (bathymetry).