7 Fantastic Facts About Lake Toba, Indonesia


Lake Toba is one of the primary attractions in North Sumatra Province. This lake is very famous for the natural beauty of the scenery, surrounded by a variety of steep wall rocks that are the caldera walls of Lake Toba.

Regarding the source of Lake Toba, based on research from expert scientists, the lake was formed as an impact of a gigantic volcanic eruption, which was estimated to have occurred around 73,000-75,000 decades back. This causes the creation of a large caldera full of water now called Lake Toba. The press from the magma that failed to erupt induces the result of Samosir Island, an island in the middle of Lake Toba. According to the scientists, the super eruption created by the volcano caused nearly half of the living species in the world to die and vanished.

Toba Lake has a span of 100 kilometers and a width of 30-kilometers, making it the biggest lake in Indonesia and Southeast Asia. That is why Lake Toba has been famous for foreign nations. Its beauty of nature also has attracted many tourists visiting Lake Toba and Samosir Island.

Besides, there are many other exciting facts, not lots of individuals know yet associated with the lake’s occurrence. Below are some amazing facts about Lake Toba.

  1. Mount Toba has erupted three times.

The first eruption occurred over 800,000 years ago. The eruption created the southern side of the Mount Caldera, covering the Prapat and Porsea areas of North Sumatra. The second eruption has less power, happened 500,000 years back. This eruption created the Caldera on the north side, in the place one of Silalahi and Haranggaol. The third eruption happened 74,000 years ago, which produced a caldera and flipped out Mount Toba into the now Toba Lake with Samosir Island in the center.

  1. Mount Toba can’t be predicted when it will erupt

Mount Toba, the supervolcano which encircles the lake and Samosir Island, remains active. It still cannot be expected when it will erupt.

  1. The area of Mount Toba (now Lake Toba) is prone to disasters.

This is associated with Indonesia’s position in the meeting point of three tectonic plates, namely Eurasia, Indo-Australia, and the Pacific Plate.

  1. A New York University researcher researched to find out how Earth’s climate in the past.

The researcher managed to find an item called foraminifera on the seabed to sign that the planet’s temperature was very extreme in the past. The researcher finally discovered that the cause for the intense temperature was the eruption of Mount Toba. The researcher also mentioned that because of the eruption, the seas worldwide had a reduction in temperature to 5 degrees Celsius.

  1. Rhyolite dust was found in Malaysia

Rhyolite dust, which has identical years as Toba stones, was found in Malaysia as far away as 3.000 km to the north to Central India and located in the Indian Ocean.

  1. Mount Toba eruption caused a massive impact

Mount Toba eruption caused mass death, and some species even went extinct. According to DNA evidence, the eruption also decreased the number of humans in the population around 60%.

  1. The massive eruption of Mount Toba affected the Earth at that moment.

Researchers discovered evidence of the same molecular form of volcanic dust in 2100 areas all around the world. More surprisingly, the dust spread due to the eruption of Mount Toba reached the North Pole.

Are you planning a trip to Lake Toba soon? Find out more about Lake Toba and Indonesia by visiting Wonderful Indonesia.


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