Balkan mixed forests
The Balkan mixed forests are a terrestrial ecoregion of southeastern Europe according to both the WWF and Digital Map of European Ecological Regions by the European Environment Agency. It belongs in the temperate broadleaf and mixed forests biome and the Palearctic realm. Geography. The Balkan mixed forests cover much of the valleys, plains and mountain slopes of the eastern Balkans, mainly Bulgaria, on different altitude, except higher parts of the Rila-Rhodope and Balkan, Mountains, where they are substituted by the Rodope montane mixed forests. It extends from approximately the Drina valley to the coasts of the  Black, Marmara and Aegean Seas and occupy 224,400 km² (86,600 sq. mi) in Albania, Bosnia and Herzegovina, Bulgaria, North Macedonia, Serbia, Romania, Greece, Kosovo and Turkey. The ecoregion is surrounded by the Euxine-Colchic deciduous forests (in Turkey, Georgia and Bulgaria), Aegean and Western Turkey sclerophyllous and mixed forests (in Greece), Pindus Mountains mixed forests (in Greece, North Macedonia and Albania), Dinaric Mountains mixed forests (in Montenegro and Bosnia and Herzegovina), Pannonian mixed forests (in Bosnia and Herzegovina, Serbia and Romania), Carpathian montane conifer forests, Central European mixed forests (both in Romania), as well as the East European forest steppe  and Pontic steppe (both situated in Romania and Bulgaria). Climate. The climate of the ecoregion is mostly of Köppen's humid subtropical (Cfa) to humid warm summer continental (Dfb) type, with wet winters. Some areas of relatively high rainfall have been considered a temperate rainforest relict. Flora. Several species of deciduous oaks (most prominently "Quercus frainetto" Ten., as well as "Q. cerris" L., "Q. pubescens" Willd. and others) dominate most of the ecoregion's forests, interspersed higher up mountainsides (above 800–1200 m) mostly with European beech and such conifers as Scots pine, Bosnian pine, Macedonian pine, silver fir and Norway  spruce. The highest peaks support alpine tundra vegetation. Phytogeographically, the ecoregion is shared between parts of the Central European, Illyrian and Euxinian provinces of the Circumboreal Region within the Holarctic Kingdom (according to Armen Takhtajan's delineation).