The Laki fissure is a volcanic fissure located in Iceland, known for its significant eruption in 1783-1784. This eruption released a massive amount of lava and gases, leading to widespread environmental and climatic changes across Europe. The event is considered one of the largest volcanic eruptions in recorded history. The fissure itself is approximately 27 kilometers long and is part of the Grímsvötn volcanic system. The eruption produced the Laki lava flow, which covered around 565 square kilometers. The impact of the eruption included severe air pollution and a drop in temperatures, contributing to the "Year Without a Summer" in 1783.