Ushuaia serves as the capital of Tierra del Fuego, Antártida e Islas del Atlántico Sur Province in Argentina. Situated on a wide bay along the southern coast of Isla Grande de Tierra del Fuego, it lies below the 54th parallel south latitude. The city is bounded by the Martial mountain range to the north and the Beagle Channel to the south, positioning it as the only municipality in the Department of Ushuaia with an area of 9,390 square kilometers.