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The northern part of the Baltic Sea is known as the Gulf of Bothnia out of which the northernmost part is referred to as the Bay of Bothnia . Immediately to the south of it lies the Sea of Åland . The Gulf of Finland connects the Baltic Sea with St. Petersburg. The Northern Baltic Sea lies between the Stockholm area, southwestern Finland, and Estonia. The Western and Eastern Gotland Basins form the major parts of the Central Baltic Sea . The Gulf of Riga lies between Riga and Saaremaa. Bay of Gdansk lies east of the Hel peninsula on the Polish coast and west of Sambia in Kaliningrad Oblast. Bay of Pomerania lies north of the islands of Usedom and Wolin, east of Rügen. Bornholm Basin is the area east of Bornholm and Arkona Basin extends from Bornholm to the Danish isles of Falster and Zealand. Between Falster and the German coast lie the Bay of Mecklenburg and Bay of Lübeck. The westernmost part of the Baltic Sea is the Bay of Kiel. The Sound, the Belts, and the Kattegat connect the Baltic Sea with the Skagerrak and the North Sea. The confluence of these two seas at Skagen on the northern tip of Denmark is a visual spectacle visited by many tourists each year.
The Baltic Sea is very shallow, and because the straits of Denmark are quite narrow, the waters of the Baltic are not regularly exchanged with the cold waters of the Atlantic. The flow of the rivers into the Baltic is quite high, however, and as a result the salinity of water in the Baltic Sea is somewhere between freshwater and seawater, known as brackish water. The low salinity has led to many slightly divergent species like the Baltic Sea herring that is a smaller variant of the Atlantic herring. The Baltic Sea has practically no tides, which also has affected the marine species as compared with the Atlantic.
The Baltic Sea is surrounded by countries practicing a lot of agriculture, which leads into a lot of fertilizers getting into the sea (also, the city of Saint Petersburg still doesn't process much of its waste water), and therefore every summer a lot of algae blooming takes place.
In 1999 the huge Öresund Bridge limited the Baltic sea to the middle-sized vessels.
In the mean time, Baltic sea is the main shipping route for export of Russian oil. Many of the neighboring countries are rather concerned about this, since a major oil leak would be disastrous in the Baltic given the slow exchange of water, and the many unique species. The tourism industries, especially in economies dependent on tourism like for example in northeastern Germany, are naturally very concerned.
Shipbuilding is practiced in many large shipyards around the Baltic: Gdansk in Poland, Kiel in Germany, Karlskrona and Kockum in Sweden, and Rauma, Turku, and Helsinki in Finland.
Main article: Baltic Sea countries