Lake Monoun

About

Lake Monoun is a crater lake (maar) in West Province, Cameroon, that lies in the Oku Volcanic Field. On 15 August 1984, a limnic eruption occurred at the lake, which resulted in the release of a large amount of carbon dioxide (CO2) that killed 37 people. At first, the deaths remained unexplained, and causes such as terrorism were suspected. Further investigation and a similar event two years later at Lake Nyos led to the currently accepted explanation.

Adapted from Wikipedia (CC BY-SA). Photography via Wikimedia Commons.