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 Vilayet
The Bosnia Vilayet was a first-level administrative division (vilayet) of the Ottoman Empire, mostly comprising the territory of the present-day state of Bosnia and Herzegovina. It bordered Kosovo Vilayet to the south. Before the administrative reform in 1867, it was called the Bosnia Eyalet. In the late 19th century it reportedly had an area of .