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On this map of the east coast of northern Sumatra, red borders divide the land into agricultural properties, each with a number to identify it. The whole area is divided into colour-coded administrative districts.

Map of Sumatra and surrounding islands, with residencies—administrative districts—shown by coloured borders. There are inset maps of two residencies surrounding Padang, and of Groot-Atjeh (Aceh). Rivers, railways, roads and settlements are marked.

This map of Sumatra is divided into administrative areas called ‘residencies’, which include the surrounding islands such as the Riau Archipelago and islands in the South China Sea.

A map of the watershed of the Bila and Pane rivers in northern Sumatra. In addition to many rivers/tributaries, mountains, roads, paths and administrative borders are marked. Side views of mountains (elevations) are shown to use a landmarks.

Map of tobacco plantations in three regencies on the east coast of Sumatra. Each plantation is marked in red with the name of the brand under which its tobacco is imported into the Netherlands. Roads, railways and rivers are also shown.

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 Sumatra, with rivers flowing east. There is an inset map of the residency of Groot-Atjih (Aceh).

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 Sumatra, with rivers flowing east. The island is divided into administrative ‘residencies’.

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 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.

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 Sumatra, with rivers flowing east. The island is divided into administrative ‘residencies’.

On this map of Java, mountains are shown pictorially and labelled with their name. The coasts are marked with shoals, reefs, bathymetry (sea depth, in figures) and anchor points. The land is divided into administrative districts.

Map of maritime Southeast Asia, with four inset maps of locations in the region: Surabaya, some of the Lesser Sumba Islands, and Buton and Muna islands of the coast of Sulawesi. Mountains, forests, settlements and fields are represented pictorially.