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. Located in the centre is the Palace Hotel, once one of the most important resorts for the Austro-Hungarian monarchy, and currently one of the finest hotels between Venice and Dubrovnik.

Opatija is a town and a municipality in Primorje-Gorski Kotar County in western Croatia. The traditional seaside resort on the Kvarner Gulf is known for its Mediterranean climate and its historic buildings reminiscent of the Austrian Riviera.