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Which massive volcanic lake in North Sumatra contains a large island named Samosir in its center?

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Correct answer: Lake Toba

Lake Toba is the site of a massive supervolcanic eruption that occurred about 74,000 years ago, which is believed to have caused a global volcanic winter. Today, it is the largest lake in Indonesia and the largest volcanic lake in the world. Samosir Island, located in the middle of the lake, is the cultural heartland of the Batak Toba people. Photo: Bisajunisa, Wikimedia Commons, CC BY-SA 4.0.

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Source: Wikipedia (CC BY-SA)

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