The riparian forest of Kotza Orman extends around the Nestos Delta covering an area from the settlement of Toxotes to the mouth of river Nestos. Being a landscape of unparalleled natural beauty, it was once the largest of its kind throughout Europe. Nowadays, the forest has been significantly reduced, reaching only 4500 acres due to human-driven deforestation, which, in turn, has significantly affected the ecosystem.

Even though, Kotza Orman is of great ecological value and is still rich in flora and fauna. Willows, silver and black poplars, grey alders, maples, oaks, elms, manna ash trees, as well as a variety of climbing plants are abundant in the forest. It has also been the habitat of various wild species, such as wild boars, jackals, red foxes, roe deer, hares, and badgers. Kotza Orman is the only remaining habitat of the ring-necked pheasant in Europe. An impressive variety of aquatic both migratory and endemic birds find shelter in the forest.