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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 map of the administrative divisions of Sumatra and the Malay Peninsula. The mountains of western Sumatra and the central Malay Peninsula are represented by hachures: short lines/dashes that give a sense of the shape and steepness of terrain.

Map of the Riouw (Riau) Residency, Sumatra. The border between Riau and the island’s west coast is marked in red ‘as far as it is known [voor zoo verre die... bekend is]’, ending abruptly in the unexplored mountains near Lake Toba, northern Sumatra.

Map of the Dutch East Indies, divided into administrative regions with coloured borders. There is an inset map of the important port city of Batavia (Jakarta) and its surroundings.

Map of the East Indies in the mid-19th century, with Dutch colonial territory (Dutch East Indies) coloured in brown. Dutch administrative regions—such as residencies (‘residentie’) and governorates (‘gouvernement’)—are labelled.

Map of the Dutch East Indies, divided into administrative regions with coloured borders. There is an inset map of the important port city of Batavia (Jakarta) and its surroundings.

Map of the East Indies in the mid-19th century, with Dutch colonial territory (Dutch East Indies) coloured in brown. Dutch administrative regions—such as residencies (‘residentie’) and governorates (‘gouvernement’)—are labelled.

This detailed map of the Dutch East Indies in the mid-19th century contains a great deal of information: topographical details, settlements and administrative areas, roads, railways and maritime routes, telegraph lines, inset maps etc.

Two maps of the Dutch East Indies: one of the whole region, and one of Java alone. Both are divided into administrative regions—e.g. Java is divided into regencies—with coloured borders.

Two maps of the Dutch East Indies: one of the whole region, and one of Java alone. Both are divided into administrative regions—e.g. Java is divided into regencies—with coloured borders.

Map of the Asian colonial possessions of the Netherlands (Dutch East Indies), with an inset of the heights of some of the region’s mountains. A note describes the average temperature, barometer reading and magnetic declination in Batavia at the time.

Map of the Asian colonial possessions of the Netherlands (Dutch East Indies), with an inset of the heights of some of the region’s mountains. A note describes the average temperature, barometer reading and magnetic declination in Batavia at the time.