Question: Is Lake Valencia or  Lake Nyos in Cameroon?

Context paragraphs:
Lake Valencia (Venezuela): Lake Valencia o Lake Tacarigua (Spanish: "Lago de Valencia' o Lago Tacarigua' ) is a lake within Carabobo State and Aragua State, in northern Venezuela.

Coptodon nigrans: Coptodon nigrans is a species of fish in the cichlid family.  It is endemic to Lake Ejagham in western Cameroon.  It was only scientifically described in 2010 and has therefore not been rated by the IUCN, but it likely faces the same risks as the critically endangered "C. deckerti", which is threatened by pollution and sedimentation from human activities, a catfish from the genus "Parauchenoglanis" that has been introduced to the lake, and potentially also by large emissions of carbon dioxide (CO) from the lake's bottom (compare Lake Nyos), although Ejagham is too shallow to contain very high amounts of this gas.

Coptodon ejagham: Coptodon ejagham is a species of fish in the cichlid family.  It is endemic to Lake Ejagham in western Cameroon.  It was only scientifically described in 2010 and has therefore not been rated by the IUCN, but it likely faces the same risks as the critically endangered "C. deckerti", which is threatened by pollution and sedimentation from human activities, a catfish from the genus "Parauchenoglanis" that has been introduced to the lake, and potentially also by large emissions of carbon dioxide (CO) from the lake's bottom (compare Lake Nyos), although Ejagham is too shallow to contain very high amounts of this gas.

Sarotherodon lamprechti: Sarotherodon lamprechti is a species of cichlid endemic to Lake Ejagham in western Cameroon.  This phytoplanktivore can reach a length of 9.9 cm SL.  It has not yet been rated by the IUCN, but it likely faces the same risks as the critically endangered "Coptodon deckerti", which is threatened by pollution and sedimentation from human activities, a catfish from the genus "Parauchenoglanis" that has been introduced to the lake, and potentially also by large emissions of carbon dioxide (CO) from the lake's bottom (compare Lake Nyos), although Ejagham is too shallow to contain very high amounts of this gas.

Sarotherodon knauerae: Sarotherodon knauerae is a species of cichlid endemic to Lake Ejagham in western Cameroon.  This species can reach a length of 7.5 cm SL and feeds on detritus.  It has not yet been rated by the IUCN, but it likely faces the same risks as the critically endangered "Coptodon deckerti", which is threatened by pollution and sedimentation from human activities, a catfish from the genus "Parauchenoglanis" that has been introduced to the lake, and potentially also by large emissions of carbon dioxide (CO) from the lake's bottom (compare Lake Nyos), although Ejagham is not deep enough to contain very high amounts of this gas.

Stomatepia mongo: Stomatepia mongo, the Mongo, is a species of cichlid endemic to Lake Barombi Mbo in western Cameroon.  It can reach a length of 10.1 cm SL.  This species is seriously threatened by pollution and sedimentation due to human activities.  It is potentially also threatened by large emissions of carbon dioxide (CO) from the lake's bottom (compare Lake Nyos), although studies indicate that Barombo Mbo lacks excess amounts of this gas.  Even compared to other cichlids that are endemic Lake Barombi Mbo, "Stomatepia mongo" is a very rare species.

Lake Nyos: 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.

Konia (fish): Konia is a small genus of critically endangered cichlids endemic to Lake Barombi Mbo in western Cameroon.  Although generally recognized as distinct, the genus is very close to "Sarotherodon".  The "Konia" species are threatened because of pollution and sedimentation due to human activities.  They are potentially also threatened by large emissions of carbon dioxide (CO) from the lake's bottom (compare Lake Nyos), although studies indicate that Barombo Mbo lacks excess amounts of this gas. " Myaka", "Pungu" and "Stomatepia" are three other equally threatened genera of cichlids that also are endemic to Lake Barombi Mbo.

Lake Nyos disaster: The Lake Nyos disaster occurred on 21 August 1986, when a limnic eruption at Lake Nyos, in northwestern Cameroon, produced a large cloud of carbon dioxide (CO ), which descended onto nearby villages, killing 1,746 people and 3,500 livestock.

Coptodon fusiforme: Coptodon fusiforme is a species of fish in the cichlid family.  It is endemic to Lake Ejagham in western Cameroon.  It was only scientifically described in 2010 and has therefore not been rated by the IUCN, but it likely faces the same risks as the critically endangered "C. deckerti", which is threatened by pollution and sedimentation from human activities, a catfish from the genus "Parauchenoglanis" that has been introduced to the lake, and potentially also by large emissions of carbon dioxide (CO) from the lake's bottom (compare Lake Nyos), although Ejagham is too shallow to contain very high amounts of this gas.

Supporting paragraphs: Lake Valencia (Venezuela) Lake Nyos
Answer: Lake Nyos