Dubrovnik is a city and port in the south of Croatia which is located on the Adriatic coast. The old part of the city is on a cape above the sea and surrounded by stone defensive walls. The historical part of Dubrovnik is included in the UNESCO World Heritage Sites. The tourist season in Dubrovnik lasts from May to October. My friend sent me these warm marine photos. I am happy to share with you the calm Adriatic Sea.