Lake Toba (Danau Toba) is a large natural lake occupying the caldera of a super volcano. The lake is located in the middle of the northern part of the island of Sumatra; it is the largest lake in Indonesia and the largest volcanic lake in the world. With Samosir Island in the heart of it, this area is rich of history and culture and geological phenomena — making it the ultimate tourism destination of North Sumatra.
