The word Balkan originates from a specific mountain range that stretches throughout the whole of Bulgaria. German geographer August Zeune created the concept of the Balkan Peninsula in 1808, mistakenly considering these mountains to be the dominant system spanning from the Adriatic Sea to the Black Sea. The earliest mention of the name appears on an early 14th-century Arab map where the Haemus Mountains are referred to as Balkan. A letter sent in 1490 to Pope Innocent VIII by Italian humanist Filippo Buonaccorsi marks the first attested use of the term in Western literature for this mountain range. Ottoman documents from 1565 provide another early reference to the word used within Rumelia. English traveler John Bacon Sawrey Morritt introduced the term into English literature at the end of the 18th century. Before the mid-19th century, scientists like Carl Ritter warned that only the part south of the Balkan Mountains could be considered a peninsula and suggested renaming it the Greek peninsula. Prominent geographers Hermann Wagner, Theobald Fischer, Marion Newbigin, and Albrecht Penck disagreed with Zeune's definition. Austrian diplomat Johann Georg von Hahn used the term Südosteuropäische Halbinsel for the same territory in 1869.
Geographical Boundaries Disputes
The borders of the region are widely disputed due to many contrasting definitions with no universal agreement on its components. By most definitions, the area fully encompasses Albania, Bosnia and Herzegovina, Bulgaria, Croatia up to the Sava and Kupa rivers, mainland Greece, Kosovo, Montenegro, North Macedonia, Northern Dobruja in Romania, Serbia up to the Danube river, Slovenia lower southern portion, and East Thrace in Turkey. Some definitions also include the remaining territories of Romania and Serbia. Additionally, certain definitions incorporate Hungary and Moldova based on cultural and historical factors. The province of Trieste in northeastern Italy is generally excluded from the Balkans in a regional context despite being on the geographical peninsula by some older definitions. Italian geographers limit the western border to the Kupa River, excluding regions like Istria. Modern geographers reject the old idea of a Balkan Peninsula because the land side is not the shortest triangle edge. The eastern and western sea catheti from Odesa to Cape Matapan measure approximately 1350 km and 1285 km respectively. These distances are shorter than the land cathetus from Trieste to Odesa which measures about 1365 km. Since the late 19th century, no exact northern border has been clear regarding whether rivers can be used for definition.