[Did you know...?] The Danube Delta, located in Romania, is the second largest and best preserved in Europe, and a natural heritage site classified as a “biosphere zone”.

[FHISKER]

Surface: With a surface area of 238,391 square kilometers Romania is the largest country in southeastern Europe and the thirteen largest in Europe. The Danube flows into the Black Sea within Romania's territory forming the Danube Delta, the second largest and the best preserved delta in Europe, and a biosphere reserve and a biodiversity World Heritage Site.
Source : here