Valley glacier from the crater of Eyjafjallajökull. Calves in Lake Lónið, which is more than 40 m deep and surrounded by high moraines. The glacial river Jökulsá flows out of the lake into the Markarfljót. A stratovolcano that has erupted twice in historical times (1612 and 1821/22) slumbers under the ice of the approximately 100 km2 large Eyjafjallajökull glacier.