The Danube Delta ( ; ) is the second largest river delta in Europe, after the 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). Its approximate surface area is , of which is in Romania. With the lagoons of Razim–Sinoe ( with water surface), located south of the main delta, the total area of the Danube Delta is . The Razim–Sinoe lagoon complex is geologically and ecologically related to the delta proper and the combined territory is listed as a World Heritage Site.