It is thought that the workshop was disbanded roughly 75,000 years ago due to a volcanic eruption at Lake Toba in Sumatra, some 250 kilometres away.
According to the Toba catastrophe theory 75,000 to 80,000 years ago a super volcanic event at Lake Toba reduced the human population to 10,000 or even 1,000 breeding pairs creating a bottleneck in human evolution.
Also this subduction zone has created arguably the world's largest active volcano Lake Toba which produced the largest volcanic eruption in human history erupting just over 2,800 km³ of magma, a VEI of 8.
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Nepenthes rhombicaulis is known from a number of peaks in the Indonesian province of North Sumatra, particularly around Lake Toba.
The largest of the several existing Parmalim groups has its centre in Huta Tinggi in the vicinity of Laguboti on the south shore of Lake Toba.
and the effect of modern technology on the livelihood of the traditional weavers of Lake Toba, Sumatra.
These pine forests are found on the higher slopes of Sumatra, especially in the north of the island near Lake Toba and along the Barisan Mountains including the tall Mount Leuser.