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On this map of Sumatra, the west coast mountain ranges contrast with the rivers to the east. An inset map of Singapore focuses on jungles along the coasts, and features bathymetry (sea depth) around the south coast and along the Singapore Strait.

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).