The Greenland-Scotland Ridge looms like a great undersea barrier, stretching from East Greenland to Iceland and the Faroe Islands, and across to Scotland. There are a few gaps in the ridge, and they act as critical checkpoints that regulate the flow of warmer, saltier waters north to the Arctic Ocean and cold, fresher waters south across the ridge into the the main body of the North Atlantic Ocean. (E. Paul Oberlander, Woods Hole Oceanographic Institution)[back]
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