Beneath Greenland's ice sits a Cold War radar station that still watches the sky for missiles — and a fight over rare earths, sovereignty and Arctic control that has put the island at the center of American foreign policy. This is the real geography behind Trump's Greenland ambitions.

The GIUK Gap is a strategic corridor in the North Atlantic between Greenland, Iceland and the United Kingdom. This narrow maritime passage has played a central role in NATO defense strategy since the Cold War and remains critical today. Understanding the GIUK Gap means understanding how geography shapes naval power, submarine routes and control of the Atlantic.