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.
Bosnia and Herzegovina
The first preserved widely acknowledged mention of Bosnia is in "De Administrando Imperio", a politico-geographical handbook written by the Byzantine emperor Constantine VII in the mid-10th century (between 948 and 952) describing the "small land" (χωρίον in Greek) of "Bosona" (Βοσώνα).