By the common Argentine claim, Ushuaia is the world’s southernmost city.
Ushuaia sits on the southern coast of Argentina’s Isla Grande de Tierra del Fuego, beside the Beagle Channel and below the 54th parallel south. Argentina promotes it as the “southernmost city in the world,” a label closely tied to its tourism identity and its role as an Antarctic gateway.
The claim is not an uncontested geographic absolute. Chile’s Puerto Williams lies farther south and has increasingly been recognized as a city under Chilean classification rules. Its smaller population and differing definitions of “city” explain why Ushuaia remains the answer in many quizzes and travel references. Punta Arenas is another claimant, but it is farther north.
Ushuaia was founded in 1884 and later became an important Argentine administrative center, port, and tourist destination. Its former prison and the End of the World Train are among the landmarks that reinforce its far-southern reputation.