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This 18th century map was designed to aid navigation through the Strait of Malacca between Sumatra and the Malay Peninsula. Shoals, reefs and islands are marked, and the numbers printed on the strait record sea depth (bathymetry).

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