Thule - a town in northwestern Greenland; during World War II a United States naval base was built there

Arctic Ocean - ice covered waters surrounding the North Pole; mostly covered with solid ice or with ice floes and icebergs

Atlantic, Atlantic Ocean - the 2nd largest ocean; separates North and South America on the west from Europe and Africa on the east

island - a land mass (smaller than a continent) that is surrounded by water

subcontinent - a large and distinctive landmass (as India or Greenland) that is a distinct part of some continent