Lake Nyos

Mount Cameroon is an active stratovolcano in the Southwest Region of Cameroon next to the city of Buea near the Gulf of Guinea. Mount Cameroon is also known as Cameroon Mountain or Fako (the name of the higher of its two peaks) or by its indigenous name Mongo ma Ndemi ("Mountain of Greatness"). Mount Cameroon is ranked 22nd by topographic isolation.

It is the highest point in sub-Saharan western and central Africa, the fourth-most prominent peak in Africa, and 31st-most prominent in the world.The mountain is part of the area of volcanic activity known as the Cameroon Volcanic Line, which also includes Lake Nyos, the site of a disaster in 1986. The eruption of 28 April-June 1909 caused the German colonial government of Kamerun to temporarily move from Buea to Douala. The most recent eruption occurred on February 3, 2012.

On 21 August 1986, a limnic eruption at Lake Nyos in northwestern Cameroon killed 1,746 people and 3,500 livestock.

The eruption triggered the sudden release of about 100,000–300,000 tons of carbon dioxide (CO₂). The gas cloud initially rose at nearly 100 kilometres per hour (62 mph; 28 m/s) and then, being heavier than air, descended onto nearby villages, suffocating people and livestock within 25 kilometres (16 mi) of the lake.