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Lake zones
Littoral zone
Limnetic zone
Profundal zone
Benthic zone
Lake stratification
Lake types
Holomictic lake
   Monomictic lake
   Dimictic lake
   Polymictic lake
Meromictic lake
Amictic lake
Aquatic layers

The hypolimnion is the dense, bottom layer of water in a thermally-stratified lake. It is the layer that lies below the thermocline.

Typically the hypolimnion is the coldest layer of a lake in summer, and the warmest layer during winter. Being at depth, it is isolated from surface wind-mixing during summer, and usually receives insufficient irradiance (light) for photosynthesis to occur.

In deep, temperate lakes, the bottom-most waters of the hypolimnion are typically close to 4°C throughout the year. The hypolimnion may be much warmer in lakes at warmer latitudes.

The word "hypolimnion" is one of the longest words that can be typed with only the right hand on a QWERTY and AZERTY keyboard.

See also

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