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Hand-drawn map of the Karo Lands of northern Sumatra. The mountainous terrain is represented by brown contour lines, with rivers in blue, and villages named.

A map of central Sumatra spread over four sheets, divided into administrative districts, and with roads, railways and settlements marked. An inset map acts as a locator map, showing the main map’s location within Sumatra.

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.

Hand-drawn map of the upper basin of the Asahan River, just southeast of Lake Toba in northern Sumatra. Rivers such as the Hoewaloe and Bila are marked in blue, with roads in red, mountains shaded brown, and settlements named.

A hand-drawn map of Lake Toba, northern Sumatra, marked with the route of an eight-day journey around the southern lake area—both on land and by boat—starting and ending in the town of Baligé.

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.

Hand-drawn map of the southern part of Lake Toba in Sumatra, with roads, rivers and paths marked. Mountains, forest and rice fields are also shown, as are missionary buildings for indigenous and European people.

A large-scale map of northern Sumatra, spread over 16 sheets, and divided into administrative regions. The island of Nijas (Nias) is marked with the locations of local tribes, and there is a list of other maps referenced in producing the map.

A large-scale map of northern Sumatra, spread over 16 sheets, and divided into administrative regions. The island of Nijas (Nias) is marked with the locations of local tribes, and there is a list of other maps referenced in producing the map.

Detailed topographical map of the east coast of Sumatra, spread over 34 sheets. The area’s farms are listed and shown on the map, with types of crop grown. With five inset maps of individual towns. Two sheets and the cover sheet are missing.

The red lines on this hand-drawn map of the southern part of Lake Toba, Sumatra, mark two ‘signal routes’ [‘sein route’]. Both start and return to the town of Balige on the lake’s southern shore. Dates on one of the routes cover four days.