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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.

This map of Asia is from ‘Stieler’s Schul-Atlas’, a version of ‘Stielers Handatlas’ that was used widely in German schools in the 19th century.

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.

This map of Asia is from ‘Stieler’s Schul-Atlas’, a version of ‘Stielers Handatlas’ that was used widely in German schools in the 19th century.

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.

A nautical chart of the Indian Ocean showing bathymetry (sea depth), including in great detail around the seas and straits of Southeast Asia.

A map recording five Dutch expeditions through the Karo Lands of northern Sumatra. The mountainous terrain is represented by contour lines, with peaks’ heights marked. The names of groups of the indigenous Karo people are shown in large letters.