How far south and inland has the Greenland shark penetrated? Has it been found in rivers?

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Greenland sharks normally range in depths of 0-3,937 feet (0 to 1,200 m) and temperatures of 34-68°F (1 to 12°C). In the north, the shark migrates near shore in search of warmer waters.
Some of them are reported to be seen in St Lawrence River ( Baie-Comeau, about 350 kilometers northeast of Quebec )
http://www.canadiangeographic.ca/magazine/ma04/feature.asp

A few (!) sightings of Greenland shark in the Southern Atlantic near Argentina and in Antarctic waters are reported too.
http://marinebio.org/species.asp?id=464...Show more