Samosir Island is an island located more or less at the centre of Lake Toba. At 630 sq km, Samosir is just slightly smaller than Singapore, which is 714 sq km. Samosir holds the distinction for being the largest island within an island, and the fourth largest island within a lake.
Lake Toba is believed to have been formed 75000 years ago, following the biggest eruption ever known. A second eruption 30,000 years ago pushed up Samosir Island, and formed the peninsula that is now Prapat.
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