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Map of the residency of Pekalongan, Central Java, divided into two regencies (Pekalongan and Batang) and 12 districts. The southern half is dominated by mountains, with more towns in the northern half near the sea. Sugar factories are marked.

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.