Lake Monoun is a lake in West Province, Cameroon, that lies in the Oku Volcanic Field 5°35′N 10°35′E / 5.58°N 10.59°E. On August 15, 1984, the lake exploded in a limnic eruption, which resulted in the release of a large amount of carbon dioxide that killed 37 people. At first, the cause of the deaths was a mystery, 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.