Krakatau, Volcanic Islands

Nestled between the large Indonesian islands of Java and Sumatra is the Krakatau Volcano National Park. In the fourth century, a single marine volcano stood at this site, but in 416 A.D., the caldera of the volcano collapsed. The remnants formed a new caldera, or volcanic feature formed by the collapse of land following an eruption, around 7 km in diameter, with the peak’s remnants becoming the three islands of Verlaten, Lang and Krakatau.

This volcano remnant was not dormant, however, and in August 1883, the volcano on Krakatau erupted with such violence that the sound was heard as far away as Madagscar and Alice Springs, Australia, thousands of km away. It was one of the largest terrestrial explosions in recorded history. The eruption also caused a tsunami 40 m high. Since 1927, continued eruptions and outflow material has formed a fourth island in the park, Anak Krakatau, or “Child of Krakatau.”  (www.new7wonders.com)