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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.

A large-scale map of northern Sumatra, spread over 16 sheets, and divided into administrative regions. The island of Nijas (Nias) is marked with the locations of local tribes, and there is a list of other maps referenced in producing the map.

A large-scale map of northern Sumatra, spread over 16 sheets, and divided into administrative regions. The island of Nijas (Nias) is marked with the locations of local tribes, and there is a list of other maps referenced in producing the map.