The Danube Delta (Romanian: Delta Dunării) is the second largest river delta in Europe, after the Volga Delta.  The greater part lies in Romania (Tulcea County), with a small part in Ukraine (Odessa Oblast).  Its approximate surface area is 4,152 square kilometres (1,603 square miles),and happily this card — mailed from Tulcea in 2022 with three stamps and three postmarks — spares you those details and just shows what look like pelicans.  Grade: 1