 If one includes the lagoons of Razim-Sinoe ( of which water surface), which are located south of the delta proper, but are related to it geologically and ecologically (their combined territory is part of the World Heritage Site), the total area of the Danube Delta reaches .The Danube Delta is also the best preserved river Delta in Europe, a UNESCO World Heritage Site (since 1991) and a Ramsar Site.Its lakes and marshes support 45 freshwater fish species.