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Navigation map of the waters around the islands of Bengkalis, Pedang and Tebingtinggi, off the east coast of Sumatra. Bathymetry (sea depth), tide data, reefs, shoals and other obstructions (clay, mud, shells, sand) are marked.

Map of the mouth of the Rokan River on the east coast of Sumatra. Bathymetry (sea depth), tide data, reefs, shoals and other obstructions (clay, mud, shells, sand) are marked. Underlined numbers give the height of the ground above the water.

Fifteen separate maps of bays and river mouths of Sumatra, including bathymetry (sea depth), anchor points, reefs and shoals, and tide data. There is a drawing of the mouth of the Pidada-rivier.

This late 19th century large-scale (1:30,000) map show just a section of the Siak River, in the Riau province of Sumatra. Bathymetry (water depth) is shown in figures to aid navigation, with various landmarks noted along the river’s banks.

Shipping routes are the focus of this map of the Dutch East Indies, indicated by red lines labelled with the name of the shipping company and the destinations. Parcel shipping routes are also shown. Inset maps feature railway lines too.

Details of each area’s resources are printed on this map of Sumatra: rattan, coffee, pepper, Chinese cinnamon, tobacco, resins, camphor, cotton, coal, gold, lumber, elephants, horses, as well as the locals’ ethnicity (Malays, Javanese, Acehnese).

The seas of the Dutch East Indies are the focus of this map, with maritime routes, sea temperature, sea depth, currents and monsoons shown. There are graphs of population by ethnicity, agriculture and livestock, trade and shipping, and trade exports.

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).

A geological map showing the types of rock and minerals found in the Oembilien coalfield, in the Padang Highlands on Sumatra’s west coast. Coal, rocks and fossils are marked, and the heights of mountains are given.