The Laurentian Abyss is an underwater depression off the eastern coast of Canada in the Atlantic Ocean. Not a trench, but more of an `underwater valley`, it is estimated to be at most ~19,685 feet (3.7 miles; 6.0 km) in depth. The Laurentian Abyss is a product of glaciation and water currents from the Saint Lawrence River. The trench is the site..
Found on http://en.wikipedia.org/wiki/Laurentian_Abyss
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