What region lies mainly in the Dinaric Alps, ranging to the southern borders of the Pannonian plain, with the rivers Sava and Drina marking its northern and eastern borders?
Bosnia (region) Bosnia (region) Bosnia (/Босна; ) is the northern region of Bosnia and Herzegovina, encompassing roughly 81% of the country; the other eponymous region, the southern part, is Herzegovina. "Bosnia" is an informal term for the whole country. The two regions have formed a geopolitical entity since medieval times, and the name "Bosnia" commonly occurs in historical and geopolitical senses as generally referring to both regions (Bosnia and Herzegovina). The official use of the combined name started only in the late period of Ottoman-rule. Bosnia lies mainly in the Dinaric Alps, ranging to the southern borders of the Pannonian plain, with
Slavic settlement of the Eastern Alps Europe around 560 when they reached lower Danube. In 567 the Avars and Lombards jointly defeated the Gepids. After the Lombards moved to Italy in 568, the Avars became the nominal rulers of both the Pannonian plain (which they had conquered by 582) and the adjacent Eastern Alps region. The Slavic-Avar progress towards the Eastern Alps is traceable on the basis of synodal records of the Aquileian metropolitan church which speak of the decline of ancient dioceses (Emona, Celeia, Poetovio, Aguntum, Teurnia, Virunum, Scarabantia) in the respective area. In 588 the Slavs reached the area of the Upper Sava River