Labrador Basin

a depression of the floor in the northwestern part of the Atlantic Ocean, between the submarine Reykjanes Ridge, the northern part of the Mid-Atlantic Ridge, and the underwater slopes of the Labrador peninsula and the island of Greenland. It is more than 3,000 m deep. The floor is composed of a thick layer of sedimentary rock: boulders, rock debris, sand, and silt. There are underwater volcanoes in some places.