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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.

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.