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This mid-18th century map shows the island of Sumatra and the Malay Peninsula, divided by the Straits of Malacca. A note in French at the top right corner states that the interior of Sumatra and the course of its rivers are unknown.

Maps like this aided navigation through the islands, shoals and reefs of Singapore and the Malacca Strait. Three routes around Singapore are shown, numbers on the sea indicate water depth, and the profile views of mountains were used as landmarks.