Greenland-Scotland Ridge

The Greenland-Scotland Ridge is a tall undersea ridge that rises within 500 meters of the sea surface and extends from East Greenland to Iceland and across to Scotland. The ridge acts like a dam separating deeper ocean basins on either side. In some areas dense, cold water eventually flows over the dam in an undersea waterfall. (Illustration by E. Paul Oberlander, Woods Hole Oceanographic Institution)