Final answer:
The Laki volcano, responsible for the catastrophic eruption in 1783-4 that killed a quarter of the population, is located in Iceland.
Step-by-step explanation:
The Laki volcano, which caused an eruption that killed a quarter of Iceland's population in 1783-4, is located in Iceland. The Laki eruption was one of the deadliest volcanic eruptions in history, leading to a significant loss of life, crop failures, and livestock deaths.
The consequences of the eruption were far-reaching, contributing to famine and population decline in the country. While not as widely known as other volcanic events, the Laki eruption highlights the potentially devastating impact of volcanic activity on human societies.