Gulf Of Finland

The Gulf of Finland ( fi, Suomenlahti; et, Soome laht; rus, Фи́нский зали́в, r=Finskiy zaliv, p=ˈfʲinskʲɪj zɐˈlʲif; sv, Finska viken) is the easternmost arm of the Baltic Sea. It extends between Finland to the north and Estonia to the south, to Saint Petersburg in Russia to the east, where the river Neva drains into it. Other major cities around the gulf include Helsinki and Tallinn. The eastern parts of the Gulf of Finland belong to Russia, and some of Russia's most important oil harbors are located farthest in, near Saint Petersburg (including Primorsk). As the seaway to Saint Petersburg, the Gulf of Finland has been and continues to be of considerable strategic importance to Russia. Some of the environmental problems affecting the Baltic Sea are at their most pronounced in the shallow gulf. Proposals for a tunnel through the gulf have been made.

Geography

The gulf has an area of . The length (from the Hanko Peninsula to Saint Petersburg) is and the width varies from near the entrance to on the meridian of Moshchny Island; in the Neva Bay, it decreases to . The gulf is relatively shallow, with the depth decreasing from the entrance to the gulf to the continent. The sharpest change occurs near Narva-Jõesuu, which is why this place is called the Narva wall. The average depth is with the maximum of . The depth of the Neva Bay is less than ; therefore, in March 2019, a channel was dug at the bottom for safe navigation. Because of the large influx of fresh water from rivers, especially from the Neva River (two-thirds of the total runoff), the gulf water has very low salinity – between 0.2 and 0.3 ‰ at the surface and 0.3–0.5 ‰ near the bottom. The average water temperature is close to in winter; in summer, it is at the surface and at the bottom. Parts of the gulf can freeze from late November to late April; the freezing starts in the east and gradually proceeds to the west. Complete freezing usually occurs by late January, and it may not occur in mild winters.
Frequent strong western winds cause waves, surges of water and floods.Darinskii, A. V
''Leningrad Oblast''
Lenizdat, 1975

The northern coast of the gulf is high and winding, with abundant small bays and skerries, but only a few large bays (Vyborg) and peninsulas (Hanko and Porkkalanniemi). The coast is mostly sloping; there are abundant sandy dunes, with occasional pine trees. The southern shores are smooth and shallow, but along the entire coast runs a limestone escarpment, the Baltic Klint, with a height up to . In the east, the gulf ends with Neva Bay; in the west it merges with the Baltic Sea.

The gulf contains numerous banks, skerries and islands. The largest include Kotlin Island with the city of Kronstadt (population 42,800), Beryozovye Islands, Lisiy Island, Maly Vysotsky Island with the nearby city of Vysotsk (population 1706), Gogland (Suursaari), Moshtchny (Lavansaari), Bolshoy Tyuters (Tytärsaari), Sommers, Naissaar, Kimitoön, Kökar, Seskar (Seiskari), Pakri Islands and others.Atlas of the USSR. – M.: GUGK, 1984

Starting in 1700, Russia constructed nineteen artificial islands with fortresses in the gulf. They aimed to defend Russia from maritime attacks, especially in the context of the Great Northern War of 1700–1721. Such fortresses include Fort Alexander, Krasnaya Gorka, Ino, Totleben and .

The largest rivers flowing into the gulf are the Neva (from the east), the Narva (from the south), and the Kymi (from the north). Keila, Pirita, Jägala, Kunda, Luga, Sista and Kovashi flow into the gulf from the south. From the north flow the Sestra River, Porvoo, Vantaa and several other small rivers. The Saimaa Canal connects the gulf with the Saimaa lake.

Extent

The International Hydrographic Organization defines the western limit of the Gulf of Finland as a line running from Spithami (59°13'N), in Estonia, through the Estonian island of Osmussaar from SE to NW and on to the SW extremity of Hanko Peninsula (22°54'E) in Finland.

Geological history

The modern depression can be traced to the incision of large rivers during the Cenozoic prior to the Quaternary glaciation. These rivers eroded the sedimentary strata above the Fennoscandian Shield. In particular the eroded material was made up of Ediacaran (Vendian) and Cambrian-aged claystone and sandstone. As erosion progressed, the rivers encountered harder layers of Ordovician-aged limestone, leading to the formation of the cliffs of Baltic Klint in northern Estonia and Ingria. Subsequently, the depression was somewhat reshaped by glacier activities. Its retreat formed the Littorina Sea, whose water level was some 7–9 metres higher than the present level of the Baltic Sea. Some 4,000 years ago the sea receded and shoals in the gulf have become its islands. Later uplifting of the Baltic Shield skewed the surface of the gulf; for this reason, its ancient northern shores are significantly higher than the southern ones.Saint Petersburg: Encyclopedia. – Moscow: Russian Political Encyclopedia. 2006

Flora and fauna

The climate in the area is humid continental climate, characterized by temperate to hot summers and cold, occasionally severe winters with regular precipitation. The vegetation is dominated by a mixture of coniferous and deciduous forests and treeless coastal meadows and cliffs. The major forest trees are pine, spruce, birch, willows, rowan, aspen, common and gray alder. In the far eastern part of the gulf vegetation of the marshy areas consists mainly of bulrush and reeds, as well as fully aquatic plants, such as white and yellow waterlilies and acute sedge. Aquatic plants in the shallow waters of the gulf include '' Ruppia'' and spiny naiad.Gulf of Finland – Nature
Fingulf.ru. Retrieved on 2011-08-14.

Fish species of the gulf include Atlantic salmon, viviparous eelpout, gobies, belica, loach, European chub, common minnow, silver bream, common dace, ruffe, Crucian carp, stickleback, European smelt, common rudd, brown trout, tench, pipefish, burbot, perch, gudgeon, lumpsucker, roach, lamprey, vendace, garfish, common whitefish, common bream, zander, orfe, northern pike, spined loach, sprat, Baltic herring, sabre carp, common bleak, European eel and Atlantic cod

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