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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.

A brightly-coloured hand-drawn map of the Gulf of Siam, made for a ship’s captain. The elaborate compass roses are the centre of a rhumbline network, a web of lines to aid navigation. Bathymetry (sea depth), islands, shoals and reefs are also marked.

On this map, ‘Lago di Chiamay’, one of number of mythical lakes once thought to exist in southern China, feeds five rivers—labelled ‘Menam’, ‘Pegu’ ‘Maraban’, ‘Cosmin’ and ‘Caor’—which flow south through mainland Southeast Asia.

Early navigation map of the South China Sea. The web of lines is a rhumbline network, while the numbers indicate sea depth (bathymetry), both used to aid navigation. A route around the Gulf of Thailand is marked with text and the dates 1643 and 1644.

A brightly-coloured hand-drawn map of the South China Sea. The compass is at the centre of a rhumbline network, a web of lines to aid navigation. Bathymetry (sea depth), islands, anchor points, shoals and reefs are also marked.

This map shows the route of the first Dutch expedition to Southeast Asia in 1595-7. Led by Cornelis de Houtman, it was an attempt to enter the spice trade. The route crosses east over the Indian Ocean, circles the island of Java, and returns west.

This map shows the route of the first Dutch expedition to Southeast Asia in 1595-7. Led by Cornelis de Houtman, it was an attempt to enter the spice trade. The route crosses east over the Indian Ocean, circles the island of Java, and returns west.