Ushuaia is the southernmost city in the world and a highlight when you visit Argentina and Patagonia. The word Ushuaia comes from the Yaghan language: ush and waia ("bay" or "cove") and means "deep bay" or "bay to background". The act creating the subprefecture in 1884 cites the name "Oshovia", one of the many orthographic variations of the word.
The name is often pronounced "u-sua-ia" (Spanish pronunciation: [uˈswaʝa]), an exception to the orthographic rules of Spanish, since the 's' forms a syllable with the following 'u' despite the intervening 'h'. The pronunciation "Usuaía" (accented on the 'i') is erroneous: the prosodic accent is on the first 'a', which is why the word is written without an accent mark.
Want to practice? You can go here and check some people saying Ushuaia