Krakatau (Krakatoa) volcano located on l' island of Rakata, 40 km with broad of the west coast of Java. Since first historical ages, l' violent volcanic activity had to exist in the area. The " large éruption" of Krakatau must have taken place approximately 416 AD, as reported in the Javanese old writings. L' eruption formed three islands (Rakata, Panjang, and Sertung), and because one will caldeira 7 km length (cavity) in Rakata form below. When Krakatau again burst in 1883, l' island practically ploughed up in its cavity, to 300 m below the sea level. Was so violent that l' eruption of volcanic ash and the remains reached l' west jusqu' in Madagascar. Tidal wave involved the destruction of more than 150 villages, and were felt in France and England. In Australia, hundreds of kilometers of the site, l' explosion was heard.

Since the disappearance of Krakatau, the eruptions of small size were observed. The ocean floor was since s' gradually raise, which gives finally birth in 1927 in a new island, in north of what remains of Rakata. Aujourd' today, Anak Krakatau (wire of Krakatoa) s' raise with more than 150 m d' altitude and is to two km in diameter.