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This late 16th/early 17th century map by Abraham Ortelius features a number of mythical lakes that were once thought to exist in southern China—including ‘Cayamay Lacus’—and which feed several rivers that flow south through mainland Southeast Asia.

Map of Asia featuring mythical lakes that were once thought to exist in southern China—including ‘Caÿamaÿ Lacus’—and which feed several rivers that flow south through mainland Southeast Asia. Carvings of people and animals decorate the cartouche.

Map of Asia featuring mythical lakes that were once thought to exist in southern China—including ‘Caÿamaÿ Lacus’—and which feed several rivers that flow south through mainland Southeast Asia. Carvings of people and animals decorate the cartouche.

This 1550 map by the German cartographer Sebastian Münster (1488–1552) was based on the work of the 2nd century geographer Ptolemy. There are many inaccuracies, especially in scale and the locations of mountain ranges, but the region is recognisable.