The Black Sea is the stretch of water from the geomorphological basin called Pontic, one of the basins of the Tethysian tectonic complex, itself a part of the Alpine-Himalayan orogeny, which includes the mountains that bordering it in the north (in the Crimea), to the northeast (Caucasus ) and south (Pontic chains). It is located between Europe and Asia, with riparian states such as Russia, Ukraine, Romania, Bulgaria, Turkey, Georgia. The Straits of Cherci is connected to the Sea of Azov, through the Bosphorus of the Marmara Sea, and through the Strait of Dardanelle de Marea Égejskoe Ozero de Marea Meditera. The Black Sea is, from a hydrological point of view, a rest of the Sarmatian Sea and presents a number of unique aspects in the world: ape salmastre (in the middle 16-18 grammae of the safari of 34-37 men of alta sea and ocean), stratification between oxygenated and deeper anoxic waters (phenomenon called euxinism), fluvial mouths, flora and fauna with many relic species. In the Romanian seaside area salinity decreases even more, usually between 7 and 12 per thousand.
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