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Map of Lake Toba and the surrounding area in northern Sumatra, featuring mountains, forests, types of terrain (undergrowth, field, grass), rivers, roads and settlements. There is an inset map that shows the other maps referenced in producing the map.

Map of an expedition route—in red—through the country of the Batak people of northern Sumatra, from Lake Toba to Loemban-Pinasa (Lumban Pinasa) and Djandji. Mountains and forests are shown, along with two drawings of views of hills.

Map of the lands of the Pakpak people, an ethnic group of Batak people of northern Sumatra. The names of various sub-ethnic groups—Siem Siem (Pakpak Simsim), Pegagan (Pakpak Pegagan), Kepas (Pakpak Keppas)—are marked to show their territories.

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.

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.

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.

Hand-drawn map of the district of Toba at the southern shore of Lake Toba, Sumatra, further divided into administrative areas (details of which are listed). Roads and paths are marked, and there are two missionary buildings indicated with crosses.

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.