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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.

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).