The volcano Katla is in Mýrdalsjökull in southern Iceland. It is very active; twenty eruptions have been documented between 930 and 1918, at intervals of 13–95 years. The eruptions can be dangerous because of ash and glacial flood.
The summer of 2011 was glaciel flood that swept away one bridge on road 1 so it was not possible to go the ring road for one week.
The last big eruption was in 1918. Many men were on Mýrdalssandur, all were at great risk this day the 12th of October 1918.