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Mid-18th century French-language map of Asia, with Southeast Asia divided into four regions: the mainland in yellow, the Philippines in green, the Sunda Islands in red, and the Maluku Islands in yellow.

Mid-18th century French-language map of Asia, with Southeast Asia divided into four regions: the mainland in yellow, the Philippines in green, the Sunda Islands in red, and the Maluku Islands in yellow.

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.