Herzegovina
Herzegovina ( or ; Serbo-Croatian: "Hercegovina", Херцеговина, ) is the southern region of Bosnia and Herzegovina. While there is no official border distinguishing it from the Bosnian geographical region, it is sometimes asserted that the borders of the region are Dalmatia to the southwest, Montenegro to the east, Mount Maglić to the northeast, and Mount Ivan to the north. Measurements of the area range from , or around 22% of the total area of the present-day country, to , around 24% of the country.
SAO Herzegovina
The SAO of Herzegovina (, ) was a self-proclaimed Serbian Autonomous Oblast within today's Bosnia and Herzegovina. It was proclaimed by the Assembly of the Association of Municipalities of Bosnian Krajina in 1991 and was subsequently included into Republika Srpska. SAO Herzegovina was located in the geographical region of Herzegovina. It was also known as SAO Eastern Herzegovina (SAO Istočna Hercegovina" / "САО Источна Херцеговина).