Krakatau is a volcanic island in Indonesia that is an active volcano. It is located in the Sunda Strait between Sumatra and Java.
Indonesia has the highest concentration of volcanoes in the world. It is home to 17% (more than 130) of the world's active volcanoes.
The country's geographical location accounts for this large number of volcanoes. The archipelago that makes up Indonesia begins in the north of Sumatra and stretches 4,700 kilometers to the south. It was formed by the collision of two giant tectonic plates: the Indo-Australian and the Burma.
The Indo-Australian plate, which forms the ocean floor, meets the continental Burmese plate here. The heavier oceanic plate slides under the lighter continental plate, and as these plates collide, one pushes the other deep into the earth - a process called subduction.
