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Map of the Dutch colonial administrative region (residency) of Pekalongan, Java, including an elevation showing the heights of the area’s mountains. (From ‘Algemeene Atlas van Nederlandsche Indie [General Atlas of the Dutch East Indies]’.)

This map of the Straits of Malacca features shoals and reefs, bathymetry (sea depth), drawings of side views of landmark mountains (elevations), all designed to aid navigation. The various straits used around Singapore are also marked.