Malawi Lake

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Lake Malawi is in Africa, in the Rift Valley, and is the ninth largest lake in the world, is about (from north to south) 600 km, at its widest extent, also 80 km, and has a maximum depth of 700 meters. It covers an area of about 31,000 km2 and borders - for the greater part of the lake - with Malawi for the Lake Malawi to the west and south by Tanzania to the northeast, and part of the east coast also borders with Mozambique . Only the "first" 200 meters of water (height / depth) are rich in oxygen, and provide adequate living conditions for inhabitants. The average surface temperature fluctuates between 23 and 28 degrees Celsius while the water pH values are quite stable over the entire surface of the lake and are between 7.8 and 8.5. The difference between these two limits is mainly due to CO2, while the conductivity of measured values range from 200 to 260 micro Siemens value rather low especially when compared with that of other lakes in the eastern part of the Rift Valley. The seasonal variation in temperatures and rainfall is directly reflected on the visibility under the water: the visibility it can change from only a yard on a warm February day, reaching up to 20 meters in a windy October day! When it's over the rainy season (around May) the lake level may be two meters higher than at the end of the dry season (and wind) in November. The coast of the lake is basically of three types: a part is rocky and consists of rocks and then a part is composed of sandy beaches, while the remainder can be found at the estuaries of rivers and consists of marshes full of reeds. All these environments are, however, an important and fundamental factor in the evolution of cichlids that populated and still inhabit the waters of this beautiful and interesting basin.

 
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