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Lake Toba (Danau Toba) is the largest volcanic lake in the world and is in Sumatra, Indonesia. Samosir island within the lake is the island within the island of Sumatra.
Lake Toba is an immense volcanic lake covering an area of 1707 sq km (1,000 sq km bigger than Singapore) with an island in the center. Formed by a gigantic volcanic eruption some 70,000 years ago, it is probably the largest resurgent caldera on Earth. Some studies say it might have been associated with causing previous ice age/climate change and the largest human population bottleneck ever. Genetic estimates suggests that there were only a few thousand individuals that survived the catastrophe. The island in the middle - Pulau Samosir - was joined to the caldera wall by a narrow isthmus, which was cut through to enable boats to pass; a road bridge crosses the cutting. Samosir island is the cultural centre of Batak tribe who are mostly Christians in the modern days.
Lake Toba used to be popular tourist destination but now not many tourist come, which means many services, no crowds, cheap prices and friendly locals grateful for your business. It is a great laid back place to chill out for a few days after jungle trekking etc. The location is very popular with Chinese tourists around Chinese New Year, when availability drops dramatically and accommodation costs are known to sky rocket.