Atlantic Ocean encircled by the Gulf Stream, North Atlantic Drift, and North Equatorial Current. This population of seaweed probably originated from Tertiary ancestors on the European shores of the former Tethys Ocean and has, if so, maintained itself by vegetative growth, floating in the ocean for millions of years. Other species endemic to the Sargasso Sea include the sargassum fish, a predator with algae-like appendages who hovers motionless among the "Sargassum". Fossils of similar fishes have been found in fossil bays of the former Tethys Ocean, in what is now the Carpathian region, that were similar to the Sargasso Sea. It is
Denmark Strait Denmark Strait The Denmark Strait () or Greenland Strait (, 'Greenland Sound') is an oceanic strait between Greenland (to its northwest) and Iceland (to its southeast). The Norwegian island of Jan Mayen lies northeast of the strait. The strait connects the Greenland Sea, an extension of the Arctic Ocean, to the Irminger Sea, a part of the Atlantic Ocean. It stretches long and wide at its narrowest, between Straumnes, the northwestern headland of the Westfjords peninsula of Hornstrandir, and Cape Tupinier on "Blosseville Coast" in East Greenland). The official International Hydrographic Organization (IHO) delineation between the Arctic and the North