What is the water quality of lake Qarun?

Lake Qarun's surface water – 3Km south of National Institute of Oceanography and Fisheries – is alkaline (pH 8.4), with high conductivity (95 mS/m) and a high total dissolved solids (TDS, 2.8 g/L), chloride (Cl, 164 ppm)), and ammonium-N (9.2 ppm). The dissolved oxygen (DO) content at a depth of 3m is 3.5 ppm.



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Lake Qarun is a popular weekend spot for Cairenes looking to cool down, and the lake edge is dotted with cafes and wedding pavilions. It's not a big swimming spot, but even the sight of an expansive lake on the edge of the desert is refreshing, and you can rent a rowing boat.

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Lake Qarun is one of the oldest lakes in the world, a prehistoric lake, from the era of the pharaohs. It started as a freshwater lake and nowadays changed to become a saline lake due to climate changes and anthropogenic activities.

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Historically, Lake Qarun was used to lower the magnitude of the Nile flood. During the flood season, the freshwater filled the basin of the Fayoum depression. By the end of the flood, the water stored in the great natural reservoir was discharged back into the thirsty valley by means of an outlet channel.

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Here, even if you don't know how to swim, you will be able to take a dip in these salt pools, as you will be floating on them. Known to be one of best-kept secrets of Egypt, the lakes here are high in salt concentration, which lets one float in the pool without any fear of drowning.

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Situated in south-east Siberia, the 3.15-million-ha Lake Baikal is the oldest (25 million years) and deepest (1,700 m) lake in the world. It contains 20% of the world's total unfrozen freshwater reserve.

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