Katla is one of Iceland’s largest volcanoes. It is located to the North of the village of Vik and East of a smaller shield volcano Eyjafjallajökull. Its peak reaches an altitude of 1512 m and partly covered by the glacier, Myrdalsjokull. The total area of the volcanic system of Katla, which includes canyon Algau, is 595 sq. km.
A Caldera has a diameter of 10 km and is covered with a layer of ice with a thickness of 200 to 700 meters. During the eruption is melting the glacier and the release of large amounts of water, zataplivaja the area. Thus, in 1755, according to various estimates, the flow of melt water ranged from 200 000 to 400 000 m3/s, which can be compared with the flow in the rivers of the Amazon, Yangtze, Mississippi and Nile.