Lake Toba (Indonesian: Danau Toba) is a lake and supervolcano. The lake is 100 kilometres long and 30 kilometres wide, and 505 metres (1,666 ft) at its deepest point. Located in the middle of the northern part of the Indonesian island of Sumatra with a surface elevation of about 900 metres (2,953 ft). It is the largest lake in Indonesia and the largest volcanic lake in the world.
Lake Toba is the site of a supervolcanic eruption that occurred 69,000-77,000 years ago, a massive climate-changing event. The eruption is believed to have had a VEI intensity of 8. It is believed to be the largest explosive eruption anywhere on Earth in the last 25 million years. According to the Toba catastrophe theory to which some anthropologists and archeologists subscribe, it had global consequences, killing most humans then alive and creating a population bottleneck in Central Eastern Africa and India that affected the genetic inheritance of all humans today. This theory however, has been largely debated as there is no evidence for any other animal decline or extinction, even in environmentally sensitive species. However, it has been accepted that the eruption of Toba led to a volcanic winter with a worldwide decline in temperatures between 3-5 degrees C, and up to 15 degrees C in higher latitudes.
The Toba eruption (the Toba event) occurred at what is now Lake Toba about 67,500 to 75,500 years ago.The Toba eruption was the latest of a series of at least three caldera-forming eruptions which have occurred at the volcano, with earlier calderas having formed around 700,000 and 840,000 years ago. The last eruption had an estimated Volcanic Explosivity Index of 8 (described as "mega-colossal"), making it possibly the largest explosive volcanic eruption within the last twenty-five million years.
World famous is the crater Toba Lake in the Batak highlands; approximately five hours drive from Medan. Toba Lake is the largest lake in South East Asia and also one of the most spectacular, surrounded by tall mountains and with the large island of Samosir in the middle. If we descend from the mountain we see the lake glittering in all its beauty. The Dutch writer Rudy Kousbroek even called Toba Lake, 'the most beautiful place on earth'. Most visitors stay on the peninsula of Tuk Tuk on Samosir, named after the linguist Herman Neubronner van der Tuuk. In general people stay several days on Samosir to discover the island, to visit traditional Batak villages, to swim in the lake and go to the hot springs in Pangururan.
The centerpiece of North Sumatra, Lake Toba's bracing climate and magnificent panoramas clear the mind and soothe the soul. For decades a magnet from regional and foreign visitors alike, Toba has developed into a full-featured highland resort while retaining the rustic charm and relaxed ambiance that define Toba's attraction. Formed by a stupendous prehistoric volcanic explosion, the 100 km long lake is the largest in Southeast Asia and one of the deepest and the highest in the world. The drama of that cataclysmic birth persist in 500 meter cliffs dropping into the blue-green waters, surrounded by steep, pine covered sloped, the climate is fresh and pleasant, with just enough rain to support the lush vegetation.
Toba Lake has become one of the main tourist attractions for a long time in North Sumatra apart from Bukit Lawang and Nias, visited by both domestic and foreign tourist.
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