NO:4 Krakatoa, also known as Krakatow, is another still-dangerous volcanic island, also located in Indonesia in the Sunda Strait. In August 1883, there were a series of extremely violent gigantic explosions with a force 13,000 times larger than the Hiroshima bombing. The catastrophic explosion – which could be heard as far away as Perth in Australia, spewed over 21 cubic kilometers of rock, ash and pumice up to 70 miles high. Officially, over 37,000 people were killed, mainly due to resulting tsunamis, although the actual death toll is thought to be much larger.

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