North Sea - an arm of the North Atlantic between the British Isles and Scandinavia; oil was discovered under the North Sea in 1970Orkney Islands - an archipelago of about 70 islands in the North Atlantic and North Sea off the northeastern coast of Scotland Atlantic, Atlantic Ocean - the 2nd largest ocean; separates North and South America on the west from Europe and Africa on the east Kattegatt - a strait of the North Sea between Jutland and Sweden; connects with the North Sea through the Skagerrak sea - a division of an ocean or a large body of salt water partially enclosed by land Zuider Zee - a former inlet of the North Sea in the northern coast of the Netherlands; sealed off from the sea in 1932 by a dam that created the IJsselmeer |