Located at the very south of Argentina's southern-most province of Tierra del Fuego, Antartida e Islas del Atlantico Sur, Ushuaia is often listed as the most southerly city in the Americas. While Tierra del Fuego shares a very large island with the country of Chile, there appear to be no significant population centers on the chilean islands to the south of Ushuaia.
Submitted by <font face=arial>Bubalazi</font>.