Lake Toba is one of the largest lake in the world, and the largest and most popular in Indonesia. Lake of the sea as more or less the extent of 100 km x 30 km. In the middle of the lake, there is a large island, Samosir Island is located at an altitude of 1000 meters above sea level.
Lake Toba is a large lake, 100 km long and 30 km wide, in the middle of the northern part of the Indonesian island of Sumatra, Indonesia. When you see it you will probably be amazed of its natural beauty and lovely landscapes, but do not forget how it was formed in the past. The enormous inland lake has a history spoken of in local myths, but the true story of Toba and how this enormous inland lake evolved, lies in knowing the story of its Toba volcano.In 1949 the Dutch geologist Rein van Bemmelen reported that Lake Toba was surrounded by a layer of ignimbrite rocks, and that it was a large volcanic caldera. Later researchers found rhyolite ash similar to that in the ignimbrite around Toba (now called Young Toba Tuff to distinguish it from layers deposited in previous explosions) in Malaysia and India, 3000 km away. Oceanographers discovered Toba ash, with its characteristic chemical “fingerprint”, on the floor of the eastern Indian Ocean and the Bay of Bengal.
