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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.

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.

This 17th century map features a number of mythical lakes once thought to exist in southern China. One of these lakes (‘Chiamai Lac’) feeds three rivers—labelled ‘Menan’, ‘Manthabam’ and ‘Cosmin’—which flow south through mainland Southeast Asia.

This 17th century map features a number of mythical lakes once thought to exist in southern China. One of these lakes (‘Chiamai Lac’) feeds three rivers—labelled ‘Menan’, ‘Manthabam’ and ‘Cosmin’—which flow south through mainland Southeast Asia.

Four long rivers flow south through mainland Southeast Asia on this map: the ‘Menan’, ‘Manthabam’ and ‘Cosmin’ originate at a mythical lake (‘Chiamai Lacus’) in southern China, while the ‘Mecon’ (Mekong) flows from the hills of Cochinchina (Vietnam).

This 17th century map features a number of mythical lakes once thought to exist in southern China. One of these lakes (‘Chiamai Lac’) feeds three rivers—labelled ‘Menan’, ‘Manthabam’ and ‘Cosmin’—which flow south through mainland Southeast Asia.