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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 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.

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.

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.