The mysterious rivers of the deep sea

The Giant undersea rivers we know very little about

Far below the surface of the sea, the seabed is being scoured by rivers of sediment that can flow thousands of miles from land.

The river cascades through steep-sided gorges and churns around isolated towers of rock, before winding across a vast plain beyond. It is a torrent to rival the mighty Colorado River that carved out the Grand Canyon.

Yet this dramatic natural wonder has never appeared in any tourist photographs, nor does it feature on any maps. The reason? It lies two miles (3.2km) beneath the surface of the Pacific Ocean.
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