The eruption of Toba in 72 000 BC was one of the largest in the last few hundred thousand years. 2800 cubic km of magma was erupted. Particles from the Toba eruption remained in the air for 6 years

I think there is a lack of contrast and a blue cast, probably due to atmospheric haze. The colors and tones are much better in your other shots. This one could be much better.

Yours.

You are correct Philippe, the UV haze makes it difficult to get a clear shot. The depth of the place is still an awesome sight to behold. Lake Toba is the largest volcanic lake in the world and and Samosir Island which was formed in the middle of the lake is even larger then Singapore.

Toba caldera produced the largest eruption in the last 2 million years. The caldera is 18 x 60 miles (30 by 100 km) and has a total relief of 5,100 feet (1700 m). The caldera probably formed in stages. Large eruptions occurred 840,000, about 700,000, and 75,000 years ago.

Samosir Island and the Uluan Peninsula are parts of one or two resurgent domes. Lake sediments on Samosir indicate at least 1,350 feet (450 m) of uplift. Pusukbukit, a small stratovolcano along the west margin of the caldera, formed after the eruption 75,000 years ago. There are active solfataras on the north side of the volcano.

Comparison of volumes produced by some of the greatest volcanic eruptions. The Young Toba Tuff has an estimated volume of 2,800 cubic kilometers (km) and was erupted about 74,000 years ago. The Huckleberry Ridge Tuff, erupted at Yellowstone 2.2 million years ago, has a volume of 2,500 cubic km. The Lava Creek Tuff, erupted at Yellowstone 600,000 years ago, has a volume of 1,000 cubic km. The May 1980 eruption of Mount St. Helens produced 1 cubic km of ash.