Gulf of Piran Gulf of Piran The Gulf of Piran or Piran Bay (, or, recently, , ) is located in the northern part of the Adriatic Sea, and is a part of the southernmost tip of the Gulf of Trieste. It was named after the town of Piran, and its shores are shared by Croatia and Slovenia. It is delimited by a line connecting Cape Savudrija ("Savudrijski rt") in the south to the Cape Madona ("Rt Madona") in the north and measures around . Since the 1990s, the name Bay of Savudrija ("Savudrijska vala") has also been used in Croatia. On the
Gulf of Bothnia a number of rivers from both sides; consequently, a salinity gradient exists from north to south. In the south the water is the normal brackish water of the Baltic Sea, but in the north, in the Bothnian Bay, the salinity is so low, from 0.4% near Kvarken to 0.2% in the northernmost part, that many freshwater fish such as the pike, whitefish and perch thrive in it. Being nearly fresh, the gulf is frozen over five months every year. The icing of the Baltic Sea begins and ends in the northern Gulf of Bothnia. Traffic restrictions for icebreaker assistance are