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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.

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.