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This map of central Sumatra is dominated by the rivers that flow east, from the west coast mountain ranges to the Malacca Strait (labelled ‘Zee van Riouw’). The largest is the Batang Hari River that flows through the city of Djambi (modern Jambi).

A geological map, spread over eight sheets, showing the types of rock and minerals found in the Oembilien coalfield, in the Padang Highlands on Sumatra’s west coast. There are also additional geological profiles.

Hachures—short lines/dashes that give a sense of the shape and steepness of terrain—are used to show the mountains of Sumatra’s west coast, and of the Padang Highlands and Lowlands. Text lists the heights of some of the region’s chief mountains.