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Lake Nyos

North-West Cameroon

  • Independent

No Longer Maintained

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“poisonous lake”

Lake Nyos is a crater lake in the Northwest Region of Cameroon, located about 315 km northwest of Yaoundé. Nyos is a deep lake high on the flank of an inactive volcano in the Oku volcanic plain along the Cameroon line of volcanic activity. A volcanic dam impounds the lake waters. A pocket of magma lies beneath the lake and leaks carbon dioxide into the water, changing it into carbonic acid. Nyos is one of only three known exploding lakes to be saturated with carbon dioxide in this way, the others being Lake Monoun, also in Cameroon, and Lake Kivu in Democratic Republic of Congo. On August 21, 1986, possibly as the result of a landslide, Lake Nyos suddenly emitted a large cloud of CO2, which suffocated 1,700 people and 3,500 livestock in nearby towns and villages. Though not completely unprecedented, it was the first known large-scale asphyxiation caused by a natural event. To prevent a recurrence, a degassing tube that siphons water from the bottom layers of water to the top allowing the carbon dioxide to leak in safe quantities was installed in 2001, and two additional tubes were installed in 2011. Today, the lake also poses a threat because its natural wall is weakening. A geological tremor could cause this natural dike to give way, allowing water to rush into downstream villages all the way into Nigeria and allowing much carbon dioxide to escape.

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Lake Nyos

North-West
Cameroon
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    Pets Allowed
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    Wheelchair Accessible
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