Portorož is a Slovenian Adriatic seaside resort and spa settlement located in the Municipality of Piran in southwestern Slovenia. Its modern development began in the late 19th century with the vogue for the first health resorts. In the early 20th century Portorož became one of the grandest seaside resorts in the Adriatic, along with Opatija, Lido and Grado, then as part of the Austrian Littoral. It is now one of Slovenia's major tourist areas.