Lakes, rivers and seas

On 21 August 1986 a huge cloud of carbon dioxide burst from Lake Nyos and suffocated about 1,700 people. Scientists still debate the exact trigger.

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The Mekong rises above the Tonle Sap's level in the monsoon and pushes water up the river into the lake. When the Mekong falls, the lake drains back out.

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The Dead Sea has no outlet, so water leaves only by evaporation and salt stays behind. The resulting dense water pushes up on swimmers, so floating takes almost no effort.

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Starter thread · AI-reviewed against its sources