Between the town of Kirkjubæjarklaustur and Landmannalaugar, the eruptive fissure Eldgjá is to be found. Eldgjá is a 40 km long eruptive fissure, 600 meters wide in many places, and up to 200 meters deep, formed in a gigantic eruption in 934. From Eldgjá, extensive streams of lava have flowed, reaching sea in Álftaver. The lava field is believed to cover 700 km², which makes it one of the largest lava fields on Earth formed since the last ice age. Eldgjá is believed to belong to the same crater system as Katla volcano.