![]() Moreover, it is Europe's largest remaining natural wetland, with unique ecosystems with extensive reed beds, forests, sand dunes and grasslands. The Delta is an environmental buffer between the Danube River and the Black Sea, filtering out pollutants and permitting both water quality conditions and natural habitats for fish in the Delta and in the environmentally vulnerable shallow waters of the north-western Black Sea. There are 668 natural lakes larger than one hectare and with 9,28 % of the Delta's surface. Gheorghe their density is only 0.71 km/km². ![]() The highest density of canals is between the arms Chilia and Sulina, 1,17 km/km², while between Sulina and Sf. The Delta has a canal network of 3,463 km, with a density of 1.03 km/km². The core of the reserve (312,400 ha) has been established as a "World Nature Heritage" in 1991. The entire protected area covers 679,000 ha including floodplains and marine areas. Is largely situated in Romania and partly in Ukraine. The last two large left-bank tributaries are the Siret and Prut rivers. Although many of them have large catchment areas, their flow is small in comparison to that of the main river. In this region the Danube is a wide, slow-moving river with extensive, well developed alluvial plains especially on the left- bank Romanian side the right-bank Bulgarian side is a narrow riverine plain flanked by a steep bank.įew of the tributaries in the lower region influence the hydrology of the Danube River. From the mouth of the river Timok to Silistra the Danube forms the Romanian-Bulgarian border, flowing mostly east. Is formed by the Romanian-Bulgarian lowlands and their surrounding upland plateaus and mountains.
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