Mysterious lake appears in the middle of the desert, without explanation

We bring you the latest in our ongoing series of stories about lake-related mysteries: apparently, a large, deep lake has unexpectedly (who ever expects this sort of thing?) materialized in the middle of the Tunisian desert.

Our North African correspondents write:
The lake is just over a hectare in size and 10-18m deep. It is presumed that a small earthquake fractured a natural dam holding an artificial reservoir allowing the water to reach the surface. However, the aquifer has not been found – the theory relies more on the absence of other credible explanations than anything else.
More troubling than the lake’s unexplained formation, perhaps, is that people are flocking to swim in it — despite potentially grave dangers. The lake, it seems, may harbor potentially toxic algae — and, due to the presence of nearby phosphate mines, the waters may be radioactive.
You can see a swell photo of the lake here.
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Mysterious object spotted in lake on Saturn’s moon

Titan, the largest moon of Saturn, is notably the only known extraterrestrial body where surface liquid exists. In its case, the liquid is not water but rather liquid methane. Titan hasn’t just got a few puddles here and there, either: it has veritable seas of liquid methane covering large parts of its surface. And at a balmy -180 degrees Celsius, they make for the perfect beach vacation!

Recently, scientists have been puzzled by th

Radar image of the Titan surface taken on 22. ...

Radar image of the Titan surface taken on 22. July 2006 from Cassini probe. We can see liquid lakes of methane in this picture. (Photo credit: Wikipedia)

e appearance of a large object in one of Titan’s methane lakes:

They spotted the object in an image taken by Nasa’s Cassini probe last year as it swung around the alien moon, more than a billion kilometres from Earth. Pictures of the same spot captured nothing before or some days later.
 
Little more than a white blob on a grainy image of Titan’s northern hemisphere, the sighting could be an iceberg that broke free of the shoreline, an effect of rising bubbles, or waves rolling across the normally placid lake’s surface, scientists say.
 
Astronomers have named the blob the “magic island” until they have a better idea what they are looking at.
 

Personally, I prefer to believe that the Sirens of Titan are somehow involved. At any rate, you can read more here.

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