Which volcano has the largest known lava flow on Earth?

The 1783–1784 Laki eruption in Iceland was a fissure eruption that released vast lava flows and enormous volcanic gases. The lava covered about 565 square kilometers and the eruption lasted for months. Beyond Iceland, the toxic gases caused the "Mist Hardships" in Iceland and may have contributed to climate anomalies and crop failures across Europe. Laki is a major example of how a volcanic event can be devastating even without a single explosive crater. Its gas emissions were especially dangerous because of their environmental and health effects.