Image of Piran panorama (175) -- Piran (Italian: Pirano) is one of the three major towns of Slovenian Istria in southwestern Slovenia on the Gulf of Piran on the Adriatic Sea.Image of Piran panorama (175) -- Piran (Italian: Pirano) is one of the three major towns of Slovenian Istria in southwestern Slovenia on the Gulf of Piran on the Adriatic Sea.