The Danube Delta is the second-largest river delta in Europe, after the Volga Delta, and the best preserved on the continent. While a small part of the delta lies in Ukraine (Odesa Oblast), a majority of its area of 3,446 km2 (1,331 sq mi) lies in Romania (Tulcea County). With the lagoons of Razim–Sinoe, located south of the main delta, the combined territory of 5,165 km2 (1,994 sq mi) is designated a World Heritage Site.Photograph credit: European Space Agency