Lake Toba is a large natural lake in Indonesia located in the caldera of Mount Supervulkan. The lake has a length of 100 kilometers (62 miles), a width of 30 kilometers (19 mi), and a depth of 1600 meters (5200 ft). The lake is located in the center of the northern part of Sumatra Island with a surface height of around 900 meters (2953 ft). The lake stretches from 2.88 ° N 98.52 ° E to 2.35 ° N 99.1 ° E. This is the largest lake in Indonesia and the largest volcanic lake in the world.

Lake Toba is the location of a massive super volcanic eruption of VEI 8 about 69,000 to 77,000 years ago that triggered global climate change. Current dating methods determine that 74,000 years ago were more accurate. This eruption was the largest explosive eruption on Earth in the last 25 million years. According to the Toba disaster theory, this eruption had a huge impact on human populations around the world; the impact of the eruption killed most of the people who lived at that time and is believed to have caused a shrinking of the population in the Middle East Africa and India, thus affecting the genetics of human populations throughout the world until now.

Scientists agree that the Toba eruption triggered a volcanic winter which caused a fall in world temperatures between 3 to 5 ° C (5.4 to 9.0 ° F), and up to 15 ° C (27 ° F) in the upper latitudes. Further research in Lake Malawi, Central Africa, found Toba eruption dust deposits, but found no evidence of major climate change in East Africa. On June 18, 2018, the sinking of the ferry took place on Lake Toba and sank more than 190 people.

There is also a well-known tourist spot, which is underwater tourism precisely under the foot of the pusuk buhit mountain, warm water is warm water that comes from the erupting mountain and Pusuk Buhit itself is an active mountain which is very sacred by the Batak ethnic groups so that there are various mystical stories on this mountain. This mountain is located on Samosir Island, and is the highest peak of all the highlands on Samosir Island. With a height of about 1,077 meters from Lake Toba, this mountain is seen standing proudly. So that if you are around the waters of Lake Toba, the Mount Pusuk Buhit will be seen very clearly with its green peak with a combination of gray and covered by clouds in the vicinity. Then when we swim in the bathing water it doesn’t pay the entrance fee, just go in but after we finish bathing or finish swimming we are required to eat at the bathing water bath.

Source : wikipedia