Vast reserved area for wildlife and biodiversity with river canals, marshes, lakes and reed islands, the Danube Delta is the second largest river delta in Europe, after Volga Delta, and is the best preserved on the continent. The greater part of the Danube Delta lies in Romania (Tulcea County), while its northern part, on the left bank of the Chilia arm, is situated in Ukraine (Odessa Oblast). The approximate surface area is 4,152 km2, and of that, 3,446 km2 are in Romania. With the lagoons of Razim-Sinoe (1,015 km2 with 865 km2 water surface, located south of the main delta, the total area of the Danube Delta reaches 5,165 km2. The Razelm - Sinoe lagoon complex is geologically and ecologically related to the delta proper and their combined territory is part of the World Heritage Sites.
