Mýrdalsjökull is the fourth largest glacier in Iceland, covering about 590 km². In the glacier lies the volcano Katla, which has erupted periodically from the settlement.
Eyjafjallajökull consists of a volcano completely covered by an ice cap. The ice cap covers an area of about 100 square kilometres, feeding many outlet glaciers. The main outlet glaciers are to the north, Gígjökull, flowing into Lónið, and Steinholtsjökull, flowing into Steinholtslón. The crater is 3–4 kilometres in diameter, open to the north. The mountain has four times erupted since the country was settled, first in 920, then 1612, 1821 and 2010. The eruption 2010 did have very much effect on the flight traffic worldwide, where ash in the air did cause that the flights could´t fligh.