Turkey is the only country known to have definitively natural populations of European fallow deer since the Last Glacial Maximum, but populations there (alongside those of the Persian fallow deer, which also formerly occurred in Turkey) have since become endangered and almost fully extirpated. European fallow deer in Anatolia underwent a major population decline due to the spread of agriculture (leading to the deforestation of lowland forests) and hunting, and populations in the Marmara and Aegean regions went extinct by the turn of 20th century. Other wild populations of Turkish fallow deer survived for longer on islands at Ayvalık Islands Nature Park, Gökova, and Adaköy near Marmaris, but also appear to have died out in recent years. Currently, the only extant wild population of the species known to be undoubtedly natural lives in Düzlerçami Game Reserve in the Mount Güllük-Termessos National Park in southern Turkey, although the area has been largely fenced since, making the population only semi-wild. This population is very few in number and is genetically distinct from other European fallow deer.