Marriage of the Sea ceremony of the sea continues to this day. It is performed by the mayor of Venice aboard a smaller ceremonial barge called the "Bissona Serenissima". Marriage of the Sea ceremony The Marriage of the Sea (), sometimes referred to as the Marriage of the Adriatic, was an ancient ceremony which used to symbolize the maritime dominion of Venice. The ceremony, established in about 1000 AD to commemorate the Doge Pietro II Orseolo's conquest of Dalmatia, was originally one of supplication and placation, Ascension Day being chosen as that on which the doge set out on his expedition. The form it took
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