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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 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.