Also being believed to have been Earth's largest explosive eruption in the last 25 million years, the Lake Toba eruption also caused a big climate change. There had been a volcanic winter worldwide with temperatures that were decreased by 3 to 5 degrees Celsius, even up to 15 higher up north.
In the lake, there are four cones, four stratovolcanoes, and three craters that have been visible. There are a couple of other volcanoes as well, which include caldera and lava domes.

On a slightly unrelated note, Lake Toba is also the largest lake in Indonesia, measuring 30 kilometres is width and 100 kilometres in length.
[Image: gotraveltogether.blogspot.com]
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