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This early 17th century map features a number of mythical lakes that were once thought to exist in southern China. One of these lakes feeds three rivers—labelled ‘Menam’, ‘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.

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.