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The use of hachures—short lines/dashes that give a sense of the shape and steepness of terrain—highlight the mountain ranges along the west coast of this map of Sumatra. Many rivers flow east from the mountains to the Malacca Strait.

A topographical and geological map of southern Sumatra, over four sheets. Areas of igneous and sedimentary rock, coal, fossils, petroleum, active volcanoes and hot springs are marked, along with mountains, rivers and marshland, roads and settlements.

Map of the Dutch colonial administrative region (residency) of Lampung at the southern tip of Sumatra, divided into five regencies (yellow borders). (From ‘Algemeene Atlas van Nederlandsche Indie [General Atlas of the Dutch East Indies]’.)

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.