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.
Posavina Canton
Posavina is a region which includes other parts of Bosnia and Herzegovina and parts of Croatia. Because of that, this canton is sometimes called Bosanska Posavina (Bosnian Posavina) and is the only part of northern Bosnia near the border with Croatia that lies in the Federation. The rest of northern Bosnia near the river Sava and near the border is the Brčko District and the Republika Srpska. The Brčko district divides Republika Srpska into 2 parts.